Black Forest Trifle

Name: Black Forest Trifle
Prep time: 45 min
Cook time: 1 h 45 min
Total time: 2 h 30 min
Cuisine: European
Ingredients: 250 g frozen pitted dark cherries; 250 g tinned pitted black cherries, in syrup, drained, syrup reserved (1 x 425 g tin); 1 Tbsp golden caster sugar; ½ tsp ground cinnamon (optional); 50 g water; 1 Tbsp cornflour, mixed with 2 Tbsp water; 4 large eggs; 100 g golden caster sugar, plus 1 Tbsp for sprinkling; 80 g self-raising flour; 20 g cocoa powder (preferably dark); 1 pinch fine sea salt; 180 g milk chocolate, small pieces or callets; 500 g milk; 100 g golden caster sugar; 20 g cornflour; 2 large eggs; 20 g unsalted butter (see tip) (optional); 40 g Kirsch (cherry brandy) (optional); 300 g double cream