Chop the garlic togethe with the parsley until it almost reaches a paste like consistency.
Heat the sauté pan and, when hot, add the oil. Add the shrimp and toss. When halfway cooked, about 1½ minutes, add the tomatoes and toss for 30 seconds to 1 minute more. Add the garlic and parsley mixture, the salt, pepper, butter, and lemon juice and toss one last time. Turn out onto a plate and serve.