Castelvetrano olives are my favorite snacking olive because they are super mild and almost buttery. With an acid green hue, they also look stunning next to the tomatoes. If you opt for a different type of olive, you may want to pare down the amount that you use. Varieties like kalamata or manzanilla are generally much saltier, so be sure to use a gentle hand with them. You can also stuff your olives for some added flavor with whipped goat cheese or pickled garlic!