Heat 2 tablespoons olive oil in a wide sauté pan over medium heat.
Add the onion with a pinch of salt and cook, stirring occasionally, until soft and translucent — 5 to 7 minutes. Onions need real time; give it to them.
Add the Garlic
Add the garlic and cook for 30 to 60 seconds, just until fragrant.
Garlic needs a fraction of the time onions do — if it starts browning quickly, pull the pan off the heat for a moment before continuing.
Deglaze with Wine
Pour in the wine and scrape up any browned bits stuck to the pan. Let it reduce until nearly gone, about 1 to 2 minutes — this is about lifting flavor off the pan, not adding a cup of wine taste to the sauce.
Add Tomatoes
Stir in the tomatoes, breaking them up slightly with a spoon. Simmer for 8 to 10 minutes, until the sauce thickens slightly and loses its raw edge.
Don't cook it longer than that — Provençale sauce should taste fresh and lively, not stewed.
Add Olives & Herbs
Stir in the olives, capers, thyme, and parsley. Simmer another 2 to 3 minutes.
Add basil at the very end, off the heat, so it stays bright instead of wilting into the sauce.
Taste & Balance
Taste and adjust with salt, pepper, or a squeeze of lemon juice if needed. The olives and capers already bring plenty of salt, so season carefully.
Serve Immediately
Spoon over fish, chicken, pasta, or vegetables while warm. Finish with a drizzle of good olive oil.