Heat 2 tbsp unsalted butter and 2 tbsp olive oil in a small skillet over medium high heat.
Add 1/2 medium finely diced red onion, 1/2 cup sliced kalamata olives, the zest of 1 large lemon, 1/3 cup capers, and 1 tbsp dried thyme to the small skillet. Stir to combine and sauté over medium heat for 8-10 minutes or until the onions begin to soften.
Add the juice of one lemon and season with kosher salt and freshly ground black pepper. Stir to combine.
Add the roasted garlic and any juices remaining from the roasting dish to the sauce. Press the garlic with the back of a spoon to break up the roasted garlic and stir to combine.
Add 1 medium tomato cut into 1/4" dice and gently stir to combine. Reduce heat to low. The tomatoes should just be warmed though and still hold their shape.