freaky veggies

I have no idea what this vegetable is. The final cooked texture was sort of melon/cucumber-like. The outside was really prickly. It had a mild, greenish taste, sort of like wintermelon.

stir-fried beef and vegetables
I marinated the beef in sa cha sauce, soy sauce and garlic, and then stir fried it together with onions and the mystery vegetable.
[beef, mystery vegetable, onions, sa cha sauce, soy sauce, garlic, ginger]