Using a tomato shark or knife, remove the core of each tomato then cut each tomato in half through the equator.
Place the tomatoes cut side down a parchment lined sheet pan.
Scatter the unpeeled garlic cloves, chili peppers, and thyme in and around the tomatoes.
Drizzle with olive oil and season with salt and pepper.
Bake in the oven for 25 minutes. Remove the tomatoes from the oven and drop the temp to 275°F.
Pour off most of the juice on the pan into a bowl. When cool enough to handle, peel the tomato skins off using your fingers and a small spoon. Discard the skins.
Place the tomatoes back into the oven at 275°F. Every hour or so take the pan out of the oven and pour off the juices into the bowl and return back to the oven.
Continue to roast for 3-4 hours or until the tomatoes have shrunk a bit and look concentrated but not too dry.
Remove the tomatoes from the oven and allow to cool.
When cool put the tomatoes, roasted garlic, chilis, and reserved tomato juice into separate containers. Discard the thyme. They will keep for 1 week in the refrigerator and 6 months in the freezer.
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Notes
This recipe is directly inspired by Tom Colicchio's cookbook "Think Like a Chef"