One day Taeka brought us a vegetable that looked like a cucumber with something horribly wrong with it. She said it was goya and that it was bitter. Great - we had no idea what to do with it.
Later on on she brought some cooked goya to us and it was delicious. I looked the vegetable up and it is called bitter melon in English. It is one of the Japanese superfoods (it e.g. lowers blood sugar, contains many anti-oxidants etc.) I outdid myself and made some goya omelettes one day. Martha Stewart beware!