Preheat oven to 100c.
Place cherry tomatoes in a baking dish in a single layer, along with rosemary, thyme and garlic (cut side up).
500 g cherry tomatoes, 2-3 sprigs fresh thyme, 2-3 springs fresh rosemary, 1 head of garlic
Sprinkle with salt and black pepper, then pour olive oil over tomatoes and garlic.
½ teaspoon fine salt, fresh ground black pepper, ¾ cup olive oil
Make sure everything has been coated in the oil, turn garlic halves cut side down, then place in the oven to bake.
Bake (uncovered) for 1 hr 45 minutes - 2 hrs, or until the tomatoes are soft and slightly wrinkled (some will have burst) - they will collapse a little as they cool in the oil.
Allow tomatoes to cool in the oil, then place them (and the oil) in an airtight container and refrigerate, adding more olive oil (if needed) to cover the tomatoes.