01 -
Heat the oven to 175°C (345°F), conventional heat. Line the base of 20 × 20 cm square tin with baking parchment and lightly grease the sides.
02 -
Measure the flavor ingredients separately. Chop nuts and dried fruit into small pieces. Dice apple or pear to 5 mm. Wash citrus before grating only the colored zest. Dissolve any instant coffee in 10 ml hot water and let it cool.
03 -
Gently melt the 200 g chocolate with the 150 g butter in a bowl over barely simmering water, keeping the bowl clear of the water. Stir until smooth and let stand 10 minutes until warm, not hot.
04 -
Whisk the eggs and sugar for 1 minute, then mix in the cooled chocolate mixture. Sift in flour, cocoa and salt and fold gently until no dry patches remain. Fold in the prepared flavor ingredients and level in the tin.
05 -
Bake for 25–33 minutes, until the edges are set and the center is firm but still moist. A skewer should show moist crumbs, never liquid batter. Fruit variations may need the longer time. Cool completely in the tin for at least 90 minutes before cutting.