Simply prepare your beans for cooking in the usual way - top and tail then chop fresh beans, or dump frozen ones in the pot. Add enough water to just cover. Add in 2-3 cloves of garlic, crushed and finely chopped, a good spoonful of butter, 1 tsp soy sauce, and salt to taste. Cover pot, bring to the boil, and simmer until tender. Drain pot, and serve as a side dish with dinner. Easy!
(Purple beans turn green when cooked.)