Step 1

Position racks in the upper and lower thirds of the oven and heat the oven to 350°F.

Step 2

Divide the tomatoes and garlic between two large rimmed baking sheets. Drizzle the oil over the tomatoes and season with 1tsp. salt and several grinds of pepper. Gently toss the tomatoes to evenly coat with the oil and then spread in a single layer.

Step 3

Put the sheets in the oven and lower the heat to 225°F. Slowly roast, switching the positions of the sheets halfway through, until the tomatoes look like juicy sun-dried tomatoes, wrinkly and slightly browned in spots, 5 to 6 hours. Let the tomatoes cool for at least 10 minutes before serving or using.