Almond flour, dark chocolate and a properly fudgy crumb

There is a particular kind of afternoon — rain against the window, the kettle just off the boil, the smell of wet sand still in your coat — that calls for something dark, squidgy and cut into generous squares. These brownies answer that call without a grain of wheat flour in sight. Ground almonds do the heavy lifting instead, bringing a quiet nutty depth and a natural moisture that keeps the middle soft for days rather than hours.

The shiny, paper-thin crust on top is not luck. It is chemistry you can nudge along: sugar fully dissolved into the eggs, a batter with enough liquid and enough fat, and a surface that sets faster than the interior. Get that right and nobody at the table will ask where the flour went.

What you'll need for a 20cm square tin

• 200g dark chocolate, around 70% cocoa solids, roughly chopped
• 150g unsalted butter, plus a little extra for greasing
• 150g caster sugar
• 75g light brown soft sugar
• 3 large eggs, at room temperature
• 100g ground almonds
• 40g cocoa powder
• 1 tsp vanilla extract
• A good pinch of fine sea salt

You will also want baking parchment, a heatproof bowl that sits snugly over a pan, and a balloon whisk you don't mind working hard.

A word on ingredients. In UK shops, "ground almonds" and "almond flour" are much the same thing; the finer the grind, the closer the crumb, so choose the lightest, driest bag you can find and avoid anything described as almond pulp or porridge meal. For the cocoa, Dutch-processed gives a darker, rounder flavour, while natural cocoa brings a sharper, more old-fashioned edge. Drinking chocolate is not a substitute — it is mostly sugar.

Method: building the shiny crust

Heat the oven to 180°C (160°C fan, gas mark 4). Line the base and sides of the tin with a single sheet of parchment, leaving a little overhang to lift the slab out later.

Melt the chocolate and butter together in a bowl set over barely simmering water, stirring now and then until glossy. Take it off the heat and let it cool for five minutes — hot chocolate will scramble the eggs.

Meanwhile, whisk the eggs, both sugars and the salt vigorously for two to three minutes, until paler, thickened and slightly mousse-like. This step matters more than any other for the crust, so don't cut it short.

Pour the warm chocolate into the egg mixture and stir briefly to combine, then add the vanilla. Sift the cocoa powder over the top and add the ground almonds. Fold gently with a spatula, scraping the bottom of the bowl, and stop the moment everything is just combined. Overworking the batter gives you a tighter, cakier brownie.

Baking, cooling and the fudgy middle

Pour the batter into the tin and level it with the back of a spoon. Bake for 22 to 26 minutes. To test, push a skewer in about 3cm from the edge: it should come out with a few damp crumbs clinging to it, while the very centre still has a faint wobble when you nudge the tin. That wobble is your friend. Pull them out and resist every instinct to give them five more minutes.

Cool completely in the tin on a wire rack — a full two hours, ideally longer. Chilling overnight gives you the cleanest, fudgiest squares. When you are ready, run a warm knife around the edge, lift the slab out by the parchment and cut into sixteen squares, wiping the blade between cuts.

Seasonal and coastal variations

Flaky sea salt is the single best addition: a light pinch scattered over the batter just before it goes in, or over the warm brownies as they come out. If you live near the coast, buy your flakes from a local producer — the size of the crystals genuinely changes how they crunch.

• Autumn: press a few blackberries or halved damsons into the surface and swirl in a spoonful of bramble jam. Serve with clotted cream.
• Winter: add the finely grated zest of an orange and a pinch of cinnamon, or stir through a spoonful of mincemeat for a Christmas tin.
• Spring: fold through rhubarb roasted with a little sugar, drained well, for a sharp, pink-flecked crumb.
• Summer: use raspberries straight from the freezer so they don't bleed, and finish with a smoked sea salt flake.

Any added fruit brings moisture, so tack three or four minutes onto the bake if you have been generous.

Keeping, fixing and serving

Stored in an airtight tin at room temperature, these keep beautifully for four days; in the fridge they will last a week, though bring them back to room temperature before serving so the texture softens again. Cut squares freeze well between sheets of parchment for up to three months — invaluable for a last-minute picnic or a flask-and-rug walk along the front.

If yours came out cakey, you overbaked them; next time take them out earlier and trust the wobble. If they crumble at the edges, the batter was probably overmixed. Both are still excellent crumbled over ice cream.

Serve them warm with vanilla ice cream, cool with a cup of tea, or wrapped in greaseproof paper in a coat pocket, eaten with salty fingers on a windy beach. That, to my mind, is what home baking is for.