For more detailed instructions, please see the original recipe: Cherry crumble bars 1 cup (12 ounces/ 340 grams) cherry jam or preserves 2 teaspoons finely grated orange zest 1 tablespoon ...

There are many different types of cherry, including maraschino, griotte and Morello cherries, from which kirsch and Black Forest gâteaux are made. Look out for telltale punnets of deep red ...