Mid-week cooking with a Sunday brain. I want a soup that goes from freezer to bowl in fifteen minutes on a Wednesday night when I cannot face standing at the stove from scratch. So I make the whole pot tonight after work, eat one bowl, portion the rest, and stack it in the freezer ready to pull. The trick that makes this work is keeping the cream out of the freezer entirely – the base freezes cleanly, and the cream goes in when the bowl is on the bench, which is also when it tastes the best.
Why hold the cream back
Cream-thickened soups don’t freeze well as a finished product. The dairy fats and proteins behave differently after a slow freeze and a slow thaw: the emulsion breaks, the cream beads up against the broth, and what comes out of the bag looks faintly curdled even when it isn’t. You can rescue it with a hard whisk and a bit of heat, but it never quite gets back to glossy.
The fix is to freeze the base – mushrooms, stock, aromatics, rouxEqual parts flour and butter cooked together as the base for a sauce or soup – briefly for a pale béchamel, longer for the dark roux of a gumbo. – and add the cream at reheat. The base is a thickened broth with the texture of a thin gravy; it freezes and thaws as cleanly as any stock-based soup, and the cream poured into the hot pot just before serving gives you a fresher, brighter result than a soup that’s been sitting in cream for a week anyway. Same logic for the lemon juice and any fresh herbs: those go in at the bowl, not in the freezer bag.
Yield and time
- Makes: about 8 servings
- Hands-on: 1 hour 15 minutes
- Total: 2 hours (including porcini soak and simmer)
Ingredients
The base (the part that freezes)
- 30g dried porcini mushrooms
- 500ml just-boiled water (for soaking the porcini)
- 1kg fresh mushrooms (a mix is better than one variety – 600g Swiss browns for body, 400g button or field mushrooms for the broth; if you can get a few oyster or shiitake in there, even better)
- 75g unsalted butter
- 2 tablespoons olive oil
- 2 large brown onions, finely diced
- 4 cloves garlic, finely chopped
- 6 sprigs fresh thyme (or 1 teaspoon dried)
- 2 bay leaves
- 30ml whisky (an unpeated, softer one – a bourbon or a Speyside; nothing smoky)
- 50g plain flour
- 1.2 litres chicken or vegetable stock (a good shop-bought one is fine; bouillon cubes also fine if that’s what’s open)
- salt, pepper
- about 1/8 of a whole nutmeg, freshly grated
To finish (per serving, added at reheat)
- 50-60ml double cream per bowl (so about 400-500ml total if you’re heating the whole pot, which you won’t be – this is per portion)
- a squeeze of lemon juice
- chopped flat-leaf parsley or chives
- optional: a few extra mushroom slices, fried hard in butter, scattered on top
You’ll want a wide heavy-based pan (a 28cm sauté pan or a 26cm casserole), a stick blender, and 6-8 freezer-safe containers or zip-lock bags.
Wednesday evening: soak the porcini
The porcini get tipped into a heatproof jug with the 500ml just-boiled water and left to swell for fifteen minutes while everything else gets going. Two jobs here. The dried mushrooms rehydrate into something I can chop and stir into the pan; the soaking liquid becomes the deepest, most savoury part of the stock. A good cream of mushroom soup leans on dried porcini for the same reason a good beef stock leans on roasted bones – the concentration of flavour you can’t get out of fresh ingredients alone.
When they’re soft, I lift the porcini out with a fork (leaving the grit behind), squeeze them gently, and chop them roughly. The soaking liquid goes through a fine sieve or a coffee filter to catch the grit, and lives in a jug ready for the pot.
Wednesday evening: slice and brown the mushrooms
Mushrooms are 90% water, and the first job in any mushroom-led dish is getting that water out. A pan that’s cool or crowded steams them; what you want is dark, caramelised, concentrated mushroom – almost meaty. So they go in hot, in batches, and they don’t get stirred for a good two minutes at a stretch.
I quarter the Swiss browns and slice the button mushrooms thickly – about 5mm. Don’t go thinner; they shrink to nothing as they cook.
The pan goes on high heat with a tablespoon of the oil and a knob of the butter. When it’s properly hot – the butter foam subsiding and the surface shimmering – in goes a third of the mushrooms in a single layer. Two minutes undisturbed, then a stir, then another two minutes. They should be deeply golden on the cut faces and the pan should smell roasted, not stewed. Out into a bowl, second batch in, repeat. Third batch the same. By the third batch you’re using less fat because the mushrooms are giving up their own.
Don’t season the mushrooms in the pan – salt draws water and you’ll undo the browning you’re trying to build. Salt goes in later, with the stock.
Wednesday evening: aromatics, roux, stock
Heat down to medium-low. The remaining butter into the pan, then the 2 diced onions with a pinch of salt. Twelve minutes, stirring now and then – I want them soft and translucent with a few golden edges, not properly caramelised. Mushroom soup wants the onion in the background, not as a feature.
In go the 4 chopped garlic, the chopped rehydrated porcini, the thyme sprigs, and the 2 bay leaves. A minute, stirring, until the garlic smells cooked.
deglazeAdding liquid – wine, stock, spirit, water – to a hot pan to dissolve the browned residue (the fond) clinging to the bottom and lift it into the sauce. with the 30ml whisky – a hard sizzle (and a flash of flame if your hob’s gas and your luck’s in), scrape the bottom of the pan with a wooden spoon to lift the brown bits, and let it reduce until the pan is almost dry. Two or three minutes – whisky is twice as alcoholic as a fortified wine, and you want every trace of the burn cooked off before the stock goes in. What’s left is the oak and the sweetness, doing the same job a Madeira would: a layer of dark, savoury depth that the stock alone can’t carry.
Sprinkle the 50g flour over the pan and stir for a minute or two, coating everything. The flour going into hot fat is the same roux that thickens a béchamel – cooking it briefly takes the raw-flour taste off and gives the base its body once the stock goes in.
Now the wet stuff. The 1.2 litres of stock and the strained porcini liquid go in slowly, a third at a time, stirring each addition smooth before the next. Tip the browned mushrooms back in along with any juice in the bowl. Up to a simmer, then back down to a steady low one – a few bubbles at the surface, not a rolling boil. Twenty-five minutes, lid off, the odd stir.
By the end the soup should taste deep and savoury and feel slightly thicker than a stock – think gravy, not custard. Pluck out the thyme stems and the bay leaves. Grate the eighth of a nutmeg in. Season with salt and plenty of pepper; taste; adjust. Be a touch under on salt – the cream and the reheat will both concentrate things slightly, and a soup that’s perfect now will be over-seasoned at the bowl.
Wednesday evening: blend, eat one, portion the rest
I use a stick blender straight in the pan and pulse rather than blitz. Mushroom soup is at its best with two textures in it – a silky body and visible pieces. About fifteen seconds of pulsing gets me there: most of the soup goes smooth, the bigger mushroom pieces stay recognisable. If you prefer it completely smooth, blend it longer; if you want it chunky, skip the blender and just press a few mushrooms against the side of the pan with the back of a spoon.
Ladle out one bowl. Stir in 50-60ml of cream, a squeeze of lemon juice, a scatter of parsley. If I’ve got the patience for it, a few extra mushroom slices fried hard in butter for the top – two minutes’ work and they turn a homely bowl into a proper one. Eat.
The rest of the pot cools on the bench for half an hour while I do the washing up. Then into containers – I aim for portions of about 350ml so a single container is one bowl’s worth. Label with the date and contents (the bag of mushroom soup that’s only labelled “soup” is a bag of mushroom soup that gets eaten last). Freeze flat if you’re using zip-lock bags – they stack better and they thaw faster.
The base keeps three months in the freezer comfortably; longer if you double-bag.
Mid-week: from freezer to bowl
The fastest path: tip a frozen portion into a small saucepan with a splash of water (the water stops the bottom catching while the frozen block thaws), lid on, low heat. Eight to ten minutes, stirring once the block has loosened, and it’ll be at a simmer. From the fridge it’s faster – four or five minutes.
Once it’s hot, kill the heat. Stir in 50-60ml of cream, a squeeze of lemon, a grind of pepper. Taste; salt if it needs it; into the bowl. Parsley or chives on top. If the fried mushroom garnish is in play, the slices go on at the last second so they don’t soften.
If the cream goes in over too much heat it can split – the bubbles tear the emulsion. Off the heat, or barely at a simmer, every time.