Vinagrete sits somewhere between a salsa and a French vinaigrette - technically closer to the latter in name, but eaten like the former. The key is the fine dice. Everything should be cut small enough to fit on a fork with a bite of meat, not chunked like a pico de gallo.
In Bahia and northeastern Brazil, vinagrete often includes finely diced cucumber and sometimes a fresh chile (malagueta or dedo-de-moça). In Rio, it's simpler - just tomato, onion, and parsley. The version above is the most widely used across the country.
Some cooks add a teaspoon of Dijon mustard to the dressing, which helps emulsify the oil and vinegar and adds a subtle background note.
Vinagrete goes on everything at a Brazilian churrasco: grilled beef, chicken, pork sausages, rice and beans. Spoon it over pan-roasted chicken thighs or over baked salmon for a lighter meal. It also works stuffed into a bread roll with grilled linguiça sausage - the acidity cuts the fat perfectly.
Best eaten the day it's made. After 24 hours in the fridge the tomatoes soften and release more liquid, making it watery. If making ahead, keep the diced vegetables separate from the dressing and combine two hours before serving.
Vinagrete doesn't store well enough for weekly prep, but it's fast enough (10 minutes) that making it fresh isn't a burden. Prep the vegetables the night before, store undressed, and add the vinegar and oil an hour before the meal. For more South American BBQ condiments including chimichurri and pebre, see our complete guide to South American condiments and cooking.