Sardine pupu is a simple, prototypically Filipino treat: Splashes of shoyu and vinegar essentially qualify it as adobo, while a crucial glug of lemon oil on top adds complexity. My favorite part is the raw onions, which I rinse under ice water, a technique that softens their bite and brings out the sweetness. This is a primo snack, or add two scoops of rice and you’ve got a meal. My recipe for the lemon oil and chile pepper water can be halved or quartered if you’d like, but they have endless uses if you want to store the extra in the fridge. If the lemon oil and chile pepper water are already made, the dish comes together in about 10 minutes.