Concasse Sauce Recipe: Fresh Tomato Essence for Classic French Dishes

This classic French sauce captures the pure essence of fresh tomatoes in a simple yet elegant preparation. The technique involves peeling, seeding, and finely dicing tomatoes to create a refined texture.

Perfect for elevating grilled meats, fish, or vegetable dishes, this sauce delivers bright, fresh flavor without overpowering the main ingredients. The process is straightforward but yields professional results.

Ingredients for Concasse Sauce

Eight simple ingredients transform into this refined French tomato sauce with bright, clean flavor.

The tomatoes are non-negotiable here—vine-ripened or heirloom varieties from farmers markets yield the best texture and flavor. Avoid watery, mealy supermarket tomatoes (the kind that taste like nothing). The olive oil should be something you’d happily drizzle on crusty bread—California Olive Ranch or Lucini are reliable brands. For the shallots, look for firm bulbs with dry, papery skins.

No fresh thyme? Dried thyme at one-third the amount works, but fresh brings that aromatic brightness the dish demands. Substitute white wine vinegar with champagne vinegar or fresh lemon juice for similar acidity. Out of basil? Fresh parsley (flat-leaf, not curly) offers a different but complementary note. The garlic can be adjusted to taste—roasted garlic adds depth if you’re feeling fancy.

This sauce keeps beautifully in the fridge for 4-5 days in an airtight container. For longer storage, freeze in ice cube trays—perfect for portioning. Always bring to room temperature before serving to let the flavors fully express. The texture may separate slightly upon storage; just stir before using.

Step-by-Step Instructions for Concasse Sauce

Master the technique that transforms fresh tomatoes into the foundation of classic French cuisine.

Step 1: Prepare and Blanch the Tomatoes

Score a small “X” on the bottom of each of the 2 lb Ripe Tomatoes. Bring a large pot of water to a rolling boil and prepare an ice bath in a separate bowl. Submerge the tomatoes in boiling water for 15-20 seconds until the skins begin to loosen.

Immediately transfer them to the ice bath to stop the cooking process. The skins should slip off easily with your fingers or a paring knife. This blanching method preserves the tomatoes’ vibrant color and fresh flavor while making them easier to peel.

Step 2: Seed and Dice the Tomatoes

Cut each peeled tomato in half horizontally and gently squeeze out the seeds over a fine-mesh strainer set in a bowl. Press on the seeds to extract all the juice, then discard the seeds. Reserve the collected juice for the sauce.

Dice the tomato flesh into ¼-inch pieces. This uniform size ensures even cooking and a consistent texture in the final sauce. You should have about 3-4 cups of diced tomatoes, depending on their juiciness.

Step 3: Sauté the Aromatics

Heat the 3 tbsp Extra-Virgin Olive Oil in a large, heavy-bottomed saucepan over medium heat. Add the finely minced 2 whole Shallots and cook, stirring occasionally, for 3-4 minutes until they become translucent and begin to soften.

Add the minced 2 cloves Garlic Cloves and cook for an additional 30 seconds until fragrant. Be careful not to let the garlic brown, as this can impart a bitter flavor. The shallots and garlic form the flavor base that will elevate the natural sweetness of the tomatoes.

Step 4: Cook the Sauce to Perfection

Add the diced tomatoes and their reserved juice to the saucepan, along with the stripped leaves from the 2 whole Fresh Thyme Sprigs. Stir in the 1 tsp Sea Salt and bring the mixture to a gentle simmer.

Cook, stirring occasionally, for 25-30 minutes until the sauce thickens and reduces by about one-third. The sauce should coat the back of a spoon but still maintain a chunky texture. Stir in the 1 tbsp White Wine Vinegar during the last 5 minutes of cooking to brighten the flavors.

Step 5: Finish and Serve

Remove the saucepan from heat and stir in the thinly sliced 0.25 cup Fresh Basil Leaves. Taste and adjust seasoning if needed. The basil should retain its vibrant green color and fresh aroma, adding a final layer of complexity to the sauce.

Let the sauce cool slightly before serving to allow the flavors to meld. This classic concasse sauce is now ready to elevate any French dish, from ratatouille to poached fish, with its bright, fresh tomato essence.

Regional Styles of These Flavors

Provençal Style

In the South of France, I add 1 tsp herbes de Provence to the sauce for an aromatic twist. The blend of lavender, rosemary, and marjoram complements the tomatoes beautifully. A drizzle of local olive oil from Nyons finishes it perfectly. 🌿

Italian Influence

When I visited Tuscany, I learned to add 1 tbsp tomato paste for depth and ½ cup dry white wine while cooking. This version, called salsa concassa, pairs wonderfully with grilled fish or pasta.

Spanish Variation

For a Spanish touch, I incorporate 1 roasted red pepper, finely diced, and a pinch of smoked paprika. This adds a subtle smokiness that works beautifully with paella or tapas. 🔥

Greek Adaptation

Inspired by Greek cuisine, I stir in ¼ cup crumbled feta and 5 chopped Kalamata olives at the end. The salty, briny flavors elevate this sauce for lamb dishes or as a meze dip.

North African Twist

I love adding ½ tsp ground cumin and ¼ tsp cinnamon for a Moroccan-inspired version. A touch of honey balances the spices, making it perfect for tagines or couscous.

Frequently Asked Questions