Broccoli, Cauliflower & Leek Soup I've been really trying to increase the diversity of prebiotic foods I've been eating recently, and wanted to combine a whole load of these in one soup! So I've added loads of onion, garlic and leeks to hearty cruciferous broccoli and cauliflower to create a delicious meal for both you and your healthy gut bacteria! 1.5-2 litres vegetable stock1 head of broccoli ((in florets))1 head of cauliflower (plus the leaves) ((in florets))2 leeks (trimmed and washed)1 onion4 cloves garlic2 medium white potatoes ((diced - skin on))Salt & Pepper1 tbsp olive oil Heat the olive oil in a large soup pot over a moderate heat and saute the onions and leeks for 5 minutes until they start to go see through. Then add the garlic and heat for a further 2 minutes.Add everything else and allow to simmer for