How to Make It
In a large saucepan, combine the olives with the pearl onions, garlic, thyme and tarragon. Add the olive oil and bring to a simmer. Cook over moderately low heat until the onions and garlic are tender, about 15 minutes. Discard the herb sprigs. Using a slotted spoon, transfer the olives, onions and garlic to a bowl. Let cool slightly and serve warm.