Put the prepeared apples, 300 grams (1½ cups) of blackberries, 100 grams (½ cup) sugar and 2 tbsp water into a saucepan and heat gently until the sugar is melted.
Simmer for 5-10 minutes until the apples have dissolved to a pulp.
Leave to cool.
To assemble the trifes
Cut 150 grams (5½ oz) of sponge cake into cubes and place in the bottom of the trifle dishes, divide 1 ½ tbsp of the alcohol of your choice between the four portions, sprinkling over the cake.
Spoon the blackberry and apple compote over the cake. You will have plenty of compote, so add as much as you like but do cover the cake.
Cover the compote with 300 grams (1 ¼ cups) of custard divided between the portions.
Whip 200 ml (1½ cups) double/heavy cream until it is soft but will hold its shape. You don't have to pipe it onto the trifles but it does look pretty. I used a Wilton 1M piping nozzle. If you don't pipe then simply pile the cream onto the custard.
Toast 25 grams (1 ½ tbsp) flaked almonds in a dry frying pan on a medium heat, moving them around until they are a golden brown.
Just before serving, Sprinkle the toasted almonds over the trifles and add a fresh blackberry and a half slice of apple to garnish.
Notes
You can make a large trifle instead of individual bowls, just follow the same steps.