Lemon. ‘Cold Chinese noodles with lemon’ Sounds pretty good to me!
On the left is ‘spicy dip noodles’ (so, the sauce and noodles are separate, when you eat, you dip the noodles in the sauce, like eating cold soba or somen).
Looks like I might have a few posts from this area, Jiyugaoka, since I’m changing jobs now. This was a little shop that had some interesting food and cooking utensils.