Nettle soup Ingredients Instructions Heat 3tbsp olive oil and 25g butter in a big pan. Add 3 sliced leeks, 3 sliced onions, 2 cloves crushed garlic and a big pinch of salt and sweat gently for 30 mins. Then add 2 large potatoes, peeled and diced, and sweat for 10 mins. Cover with 1 litre water,