I am making cookies tonight that only call for whites. I thought about making lemon squares, but my recipe calls for whole eggs, not just yolks.

I'd make a big heaping bowl of fruit curd of some sort (maybe a grapefruit curd with mint, mmm), but I'd rather make something I can bring to work so that I don't eat it all.

Does anyone have any suggestions or recipes for lemon squares that only use yolks?

Thanks!