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Boil the beans following the pack instructions, about 3 mins, then drain and mix with the oil, vinegar, garlic and mint. Meanwhile, toast the bread.
Mix the yogurt with the feta to make a rough paste, then spread half onto the toast. Top with the beetroot slices, then spread on the rest of the feta mix and pile the beans on top. Eat with your fingers or a knife and fork. Take all the different bits for the sandwich to work in small tubs and build it at your desk.