Spiced baked rice with cauliflower and squash

Name: Spiced baked rice with cauliflower and squash
Ingredients: 2 tbsp olive oil; 50g/1¾oz unsalted butter; 2 onions, thinly sliced; ½ butternut squash (approx. 350g), deseeded and cut into 1.5cm/¾in chunks; ½ cauliflower (approx. 350g), cut into small florets, plus any leaves; 6 cardamom pods; 2 tsp cumin seeds; 1 tsp ground cinnamon; pinch chilli flakes; 200g/7oz brown basmati rice, rinsed; 1 vegetable stock cube, made up with 750ml/26fl oz boiling water; 100g/3½oz frozen spinach, defrosted; 25g/1oz toasted flaked almonds