Toast the cumin, coriander and cardamom in olive oil over a low heat for 2-3 minutes.
Add the onion, green pepper and garlic. Season with salt and pepper, stir to combine, and cook under cover for 15-20 minutes until soft.
Transfer the cooked green pepper to a food processor and blend with a good amount of fresh coriander and mint. Add a few drops of lemon juice and the yoghurt.
Season to taste with salt, pepper and tabasco.
Notes
Add a small amount of water to the green pepper mix if it cooks to fast or start colouring.
Replace the plain yoghurt with Greek yoghurt or fresh goat cheese.