I prefer the romaine lettuce heart which sold three in a packet instead of the romaine lettuce sold individually. I found it more suitable for stir-frying as it hold it's shape better and provided more crunch to the dish. This veggie has to be cooked quickly to preserve the green color or else it will turn black and it will look unappetizing.
For vegetarian, just omit the dried small shrimps and add the tofu for protein. You can also read more about dried small shrimps here. It has calcium and magnesium which said to prevent osteoporosis, reduce blood cholesterol level, regulate the blood flow and help in hypertension. We only use a little bit of this in each dish.