Works best with small + sweet tomatoes. U can buy tsuyu if you want to keep things real simple but it’s also so easy to make. (I always make mine with hondashi because I don’t keep kombu in my pantry). Blanch + ice bath the tomatoes so they are easy to peel. It’s really nice with ginger or shiso… maybe both? The sorta thing you can throw in your fridge and forget about, and you can use the leftover tsuyu for soba also.