The olives can be made well in advance and will keep, covered in the refrigerator, for up to a week. Pop them in the oven just as your guests arrive; they cook quickly and are delicious warm.
Preheat oven to 325°F and position an oven rack in the center.
In a large mixing bowl, combine all ingredients. Transfer mixture to a ceramic baking dish and bake until the oil is bubbling, stirring halfway through, about 15 minutes. Remove from oven, discard rosemary sprigs and let olives cool slightly.
To serve: Transfer olives to a bowl, season with flaky sea salt and serve with fresh warm bread.
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