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Slow-Simmered Tomato Sauce

This tomato sauce is built through a gentle, slow simmer that transforms fresh or canned tomatoes into a rich, flavorful sauce. It features sautéed onions and garlic, simmered until thickened and deep in color, with fresh basil added at the end for a bright, aromatic finish. The final texture is luscious and slightly thickened, perfect for pasta or grilled vegetables.
Prep Time 10 minutes
Cook Time 45 minutes
Total Time 55 minutes
Course Main Course
Cuisine Italian
Servings 4
Calories 150 kcal

Equipment

  • Large heavy-bottomed saucepan or Dutch oven
  • Sharp Knife & Cutting Board
  • Wooden spoon or silicone spatula
  • Immersion blender (optional)

Ingredients
  

  • 2 tablespoons olive oil extra-virgin, cold-pressed
  • 1 medium yellow onion diced
  • 4 cloves garlic gently crushed or minced
  • 28 oz canned San Marzano tomatoes or fresh, chopped
  • 1 teaspoon salt adjust to taste
  • 0.5 teaspoon freshly cracked black pepper
  • 1 cup fresh basil chopped, added at the end

Instructions
 

  • Heat the olive oil in a large saucepan over medium heat until it shimmers with a gentle sizzle.
  • Add the diced onions and cook, stirring occasionally, until they turn translucent and start to soften, about 5 minutes. The aroma will be sweet and fragrant.
  • Stir in the crushed or minced garlic, cooking for about 30 seconds until fragrant; be careful not to burn it, as it can turn bitter.
  • Add the canned tomatoes (with juice) to the pan, breaking them up with your spoon if they’re chunky. Bring the mixture to a gentle simmer and let cook for 10 minutes, stirring occasionally.
  • Reduce the heat to low and let the sauce simmer gently for 30 to 45 minutes, stirring every so often. The sauce will thicken, deepen in color, and develop a rich aroma.
  • If you prefer a smoother sauce, use an immersion blender to purée it until silky, or leave it chunky for more texture. Adjust seasoning with salt and pepper to taste.
  • Once the sauce is thick and glossy, turn off the heat and stir in the chopped fresh basil. Let it sit for a minute to release its aroma.
  • Serve the sauce warm over cooked pasta, grilled vegetables, or spread on crusty bread. It’s best enjoyed fresh but will deepen in flavor as it sits.

Notes

For a richer flavor, let the sauce simmer longer. Using fresh, ripe tomatoes makes a noticeable difference, but canned San Marzanos work beautifully in off-season. Adjust seasoning as needed, and don’t rush the simmering process for the best depth of flavor.
Keyword homemade, slow simmer, tomato sauce