4–6 servings
Pour a couple tablespoons from the ½ cup of olive in into a large frying pan, warm over moderate heat, then add the shrimp and sauté until they just turn pink. Alternatively, poach the shrimp (see recipe on RiPE).
Transfer shrimp to a ceramic or glass serving dish with 1–2-inch high sides. Add the herb sprigs.
If you have a white wine open (rosé good too!), splash in a couple tablespoons to deglaze the pan, then add a couple tablespoons from the ½ cup of olive oil. Add the fennel, carrots, celery, onion, and garlic (optional). Cook until the vegetables begin to soften, about 5 minutes.
Pour vinegar into the olive oil cup until level is at ½ cup (this will be about a quarter cup vinegar). Add tomato paste (or tomato bits) to the vegetables and stir for a minute, then pout in the olive oil and vinegar. Add salt, sugar, coriander seeds, and chile flake or chiles. Bring to simmer and cook 5 more minutes then pour over the shrimp and herbs in the serving dish. Cool to room temperature, then cover with plastic wrap and refrigerate for at least 6 hours before serving, ideally overnight.