Silverbeet and lentil rolls

Ingredients

• 8 large silverbeet leaves, or an assortment of leaves which you can overlap to create 8 rolls
• 1 onion, finely chopped
• 1 tablespoon olive oil
• 1 cup cooked lentils, brown or green
• 1/2 cup courgettes, grated
• 1/4 cup mint or parsley, finely chopped
• 1/4 teaspoon ground cumin
• 1/2 teaspoon salt and a grind of black pepper
• 400 gram tin chopped tomatoes