1. Preheat the oven to 250°C (482°F).
2. Peel the onion and garlic clove.
3. Finely chop them and sauté them in a pan with a drizzle of olive oil.
4. Blanch the tomatoes in boiling water for 1 minute.
5. Refresh them under cold water.
6. In an ovenproof dish, mix the tomatoes with the onions and garlic.
7. Peel and dice the tomatoes.
8. Sprinkle with fresh thyme.
9. Season with salt and pepper, then drizzle with olive oil.
10. Bake and let the tomatoes confit for 30 minutes.
11. While the tomatoes are in the oven, prepare a crumble topping by mixing breadcrumbs, parmesan, and thyme in a bowl.
12. Sprinkle the pre-cooked tomatoes with sugar, then drizzle with balsamic vinegar.
13. Spread the crumble topping over the entire surface of the tomatoes.
14. Return the dish to the oven for about 20 minutes, until the crumble topping is golden brown.
15. Divide the tomato crumble into 4 small bowls.
16. Serve warm.