Lightly grease a 28 x 18 cm (11 x 7 inch) baking tin and line the base with nonstick baking paper.
Melt the chocolate together with the butter (see
Fold in the flour, ground almonds, chocolate chips and pecans, if using. Transfer to the prepared baking tin and bake in a preheated oven, 180°C (350°F), Gas Mark 4, for 25–30 minutes until just firm to the touch.
Leave the brownies to cool in the tin for 20 minutes before cutting into 12 squares and serving with the fresh berries and ice cream or crème fraîche.