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Heat the oil in a non-stick pan and fry the leek and garlic for 5-10 mins, stirring frequently, until softened, adding a splash of water if it sticks.
Tip in the cans of barley and their liquid, then stir in the bouillon powder, sage and thyme. Simmer, stirring frequently, for 4-5 mins. Add the tomatoes and spinach and cook for 2-3 mins more until the spinach is wilted, adding a splash more water if needed. Stir in most of the cheese, then serve with the remaining cheese scattered over.