Spiced vegetable biryani

Name: Spiced vegetable biryani
Ingredients: 1 tablespoon vegetable oil; 1 clove garlic, crushed; 1 medium brown onion (150g), sliced thinly; 2 teaspoon garam masala; 400 gram can diced tomatoes; 1 medium potato (200g), cut into 1cm pieces; 2 medium carrots (240g), chopped coarsely; 1/2 cup (125ml) water; 2 medium zucchini (240g), chopped coarsely; 1 medium red capsicum (200g), sliced thinly; 1 medium brown onion (150g), chopped finely; 1 1/2 cup (300g) basmati rice; 8 cardamom pods, bruised; 1/2 teaspoon chilli powder; 1/4 teaspoon ground turmeric; 1 1/2 cup (375ml) water, extra; 1/4 cup (40g) sultanas