Apple and Blackberry Bread Pudding with Brioche and Calvados

Name: Apple and Blackberry Bread Pudding with Brioche and Calvados
Ingredients: ½ stick, or 4 tablespoons, or 2 ounces, or 57 grams, unsalted butter; 6 ounces/170 grams blackberries, halved; 4 pink lady apples, peeled, and cut into a ½ inch/1 ½ centimeter dice; Juice of 1 lemon; ½ cup/110 grams sugar, plus 1 cup, plus 1 tablespoon; 1 vanilla bean, seeds and pod separated; 1 tablespoon/10 grams flour; 4 eggs; 2 cups half and half (us) or whole milk (uk); 1/3 cup calvados; 800 grams brioche (about 2 loaves), cut into 1-inch cubes; 1 container of custard (optional); ¼ cup calvados (optional)