Salted Chocolate Chunk Cookie Layer Cake

INGREDIENTS

125 g

/ 4 ½ oz. unsalted butter, at room temperature

1/3 cup

/ 85 g / 3 oz. caster sugar

2/3 cup

/ 125 g / 4 ½ oz. brown sugar

1 tsp

vanilla essence

egg, lightly beaten

175 g

/ 6 oz. dark chocolate, chopped

1/2 cup

/ 50 g / 1.7 oz. walnuts, chopped

2 cups

/ 225 g / 8 oz. plain flour

1 tsp

bicarbonate of soda

1 tsp

Maldon flaky sea salt, plus extra for sprinkling

265 milliliters

/ 9 fl. oz. double cream

3 tbsp

chocolate liqueur (optional)

300 g

/ 11 oz. dark chocolate, chopped