SHOPPING LIST: Leek and Potato Soup (1 portion) Meal Plan 2, Sunday lunch (Britain, vegetarian) [ ] 1 medium leek (about 150 g once trimmed) [ ] 150 g potatoes [ ] Reduced-salt vegetable stock cubes (you need half a cube) [ ] Semi-skimmed milk (50 ml) [ ] Olive oil (1 tsp) [ ] Black pepper Cupboard check: stock cubes, milk, olive oil and pepper are probably already at home. Tip: rinse the sliced leek well, because soil gets trapped between the layers.