瓜 (guā) is the character for "gourd", and is generally used for things in the somewhat hard-to-pronounce Cucurbitaceae family. Like the characters I mentioned on Monday, 瓜 varies in different fonts in a way that really confused me to start with (screenshot). It's worth getting to recognise, though, since not only is it used in its own right in several food-related words, it's also the radical for a few characters including the 瓣 (bàn) of 豆瓣醬 (dòu bàn jiàng) (screenshot).

Here are some ingredients that use 瓜 in the name:

As well as the above, superpitching recently discovered another 瓜 vegetable — 勝瓜 (shèng guā), which apparently translates as "sponge gourd", "angled luffa", or "Chinese okra" (pulchritude notes in comments that this is also known as 絲瓜/sī guā). I have never noticed this on a menu, but will be keeping my eyes open from now on, because in my brain a loofah is something you use in the bath, and so I would dearly like to eat one.