1. Slice and thoroughly wash leeks, sautee in olive oil with chopped onion and crushed garlic.
2. Peel and chop potatoes into small dice, add to the leeks.
3. Stir in a spoonful of mild mustard and add a sprinkle of herbs, salt and pepper.
4. Add stock and simmer.
5. After 10-15 minutes, test the potatoes - when soft zizzz
6. Serve, scoff