Lay out a piece of parchment paper on a flat baking sheet. Then spread out your tomatoes, along with your fresh rosemary, and garlic cloves. Use a brush to brush on some olive oil onto all of these ingredients. Then sprinkle your salt evenly over the entire thing. If you are eyeballing it and you think you have too much salt just use enough to your preference.

Place this in a pre-heated oven at 225F. Cook until they tomatoes dry out slightly but still have some structural integrity to them. If you overcook them they'll dissolve on your baking sheet.

Now pour these contents into a clean jar, and add your olive oil over it. This will keep for at least a few weeks. Enjoy with some fresh pasta, warm bread, or on a cracker with some cheese.