Spiced cauliflower and lentil salad

Ingredients

• 2 medium cauliflower, stem removed and cut into bite-sized florets
• 200g brown lentils
• 2 brown onions
• 2 cloves garlic
• 2 tablespoons ground cumin, divided in half
• 2 tablespoons ground coriander, divided in half
• 2 cups baby spinach leaves
• 1 cup coriander leaves, roughly chopped
• 1 cup mint leaves, roughly chopped
• 2 tablespoons olive oil
• sea salt
• freshly ground black pepper
• juice of one lemon
• 400g natural yoghurt