Stone the plums/damsons, slice and put in a saucepan with the granulated sugar. Add 50ml water, cover the pan and cook over a medium heat for 10 mins. Add to an ovenproof dish and set aside.
Put the flour in a mixing bowl and rub in the butter until it resembles breadcrumbs. Add the caster sugar, almonds, oats and ginger and stir.
Sprinkle over the fruit and bake
-40 mins until golden.
Recipe by appetite magazine at https://www.appetitemag.co.uk/plum-crumble/