Halve and stone the fruit and pack it in a shallow baking dish, filling any large gaps with chopped plums. Sprinkle the spices over the top. If the plums are very tart, sprinkle 2-3 tbsp sugar over them.
Mix the flour, sugar and ground almonds together in a large bowl. Rub in the butter with your fingertips and spread the mixture evently over the fruit. Top with the chopped nuts.
Just before baking, drizzle lightly over the top 2 tbs cold water.
Bake for 30-40 minutes at 170C until the top is golden brown.