Preheat the oven to 180°C/Gas 4. Line a brownie tin or baking tin, about 24 x 16cm or 20cm square, with baking parchment.
Break up the chocolate into small pieces and put into a heatproof bowl with the coconut oil. Set the bowl over a pan of just-simmering water and leave to melt slowly, stirring
occasionally until smooth, then leave to cool until barely warm.
You can do it in a heavy-based saucepan over a very low heat – but super carefully, removing from the heat when the chocolate is about half melted and stirring to finish the melting.
Either way, the molten mix must not be hot when you add it to the other ingredients later. Sift together the ground almonds, rice flour, salt and baking powder; set aside.
Whisk the eggs and sugar together, with the vanilla if using, until well blended and frothy. It doesn’t have to be a thick mousse: a minute with an electric whisk will do it, a couple by hand with a rotary or balloon whisk.
Make a well in the centre of the dry ingredients. Pour in the egg and sugar mix, followed by the molten chocolate. Starting slowly, mix the whole lot together with a wooden spoon or whisk until all is combined in an even but thick batter. Stir in the walnuts.
Scrape the mixture into the prepared tin, spread it out with a spatula and bake for 20–25 minutes, or until the top looks firm and a skewer inserted into the centre comes out fairly clean but with a few moist crumbs sticking to it.
Let the brownie cool in the tin completely – leave for several hours or even overnight – then cut into squares or slices. These brownies are fairly gooey and a bit fragile – but very yummy indeed. If you put them in the fridge they’ll get a bit fudgier and a bit firmer.
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