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Imagine a pasta sauce so vibrant, so velvety, that it transforms a simple weeknight dinner into something truly special. That’s exactly what this roasted red pepper pasta sauce delivers. Sweet roasted red peppers, caramelized onions, and garlic come together with a touch of tomato paste and cream for a sauce that’s both comforting and bright. Whether you’re cooking for yourself or feeding a crowd, this sauce is about to become your new go-to.
Key Ingredients
The magic of this sauce lies in its simplicity. Roasting the peppers and aromatics brings out their natural sweetness and depth, while a few pantry staples add richness and balance. It’s a flavor combination that’s hard to resist.
Ingredients List
| Ingredient | Amount |
|---|---|
| Red peppers, cut into large slices | 3 medium (420 g) |
| Sweet white onion, cut into wedges | 1 medium (230 g) |
| Garlic cloves | 8 |
| Olive oil and kosher salt (for roasting) | As needed |
| Penne rigate or tube-shaped pasta | 10 oz (255 g) |
| Butter or olive oil | 1 tbsp |
| Cashew milk or creamy milk | 1/2 cup (110 ml) |
| Pasta water | 1/4 cup (45 ml) |
| Tomato paste | 1 tbsp |
| Dried oregano | 1 tbsp |
| Red pepper flakes | 1 tsp* |
| Kosher salt | 1 tsp, plus more as needed |
| Finely grated parmesan or nutritional yeast | For serving |

Helpful Tools
To make this sauce, you’ll want a few key tools on hand:
- A sturdy baking sheet for roasting
- Parchment paper for easy cleanup
- A high-powered blender for the smoothest sauce
- A large pot for cooking your pasta
Pro-Tips
Want to take your roasted red pepper pasta sauce to the next level? Here are some tips to keep in mind:
- Don’t rush the roast: Let the peppers and onions get nicely charred for the best flavor. This step is key to developing that deep, sweet taste.
- Reserve your pasta water: That starchy water helps the sauce cling to the pasta and creates a silky texture. Never skip this step!
- Taste as you go: Adjust the salt and red pepper flakes to suit your preference. Remember, you can always add more, but you can’t take it away.
- Blend until ultra-smooth: For the creamiest sauce, blend for at least 2-3 minutes. You want it totally velvety.
- Try a protein boost: For a heartier meal, toss in some grilled chicken or shrimp. Parmesan Chicken Pasta is a great pairing if you want to add some extra protein to your plate.
How to Make Roasted Red Pepper Pasta Sauce

- Preheat and prep: Set your oven to 450°F and line a baking sheet with parchment paper.
- Roast the veggies: Toss red peppers, onion, and garlic with olive oil and salt. Roast for 25-30 minutes until slightly charred.
- Cook the pasta: While veggies roast, cook pasta according to package directions. Reserve 1/4 cup pasta water before draining.
- Blend the sauce: Combine roasted veggies, cashew milk, pasta water, tomato paste, oregano, red pepper flakes, and salt in a blender. Blend until smooth and creamy.
- Combine and serve: Pour sauce over pasta, heat gently, and stir until sauce clings. Adjust seasoning and top with parmesan or nutritional yeast.
Variations
Once you’ve mastered the classic version, try these tasty twists:
- Add smoked paprika: For a subtle smoky flavor, add a teaspoon of smoked paprika to the sauce.
- Make it vegan: Use olive oil instead of butter and nutritional yeast in place of parmesan for a dairy-free version.
- Boost the veggies: Stir in sautéed spinach, mushrooms, or zucchini for extra nutrition and color.
Roasted Red Pepper Pasta Sauce
A pasta sauce so vibrant and velvety it transforms a simple weeknight dinner into something truly special. Sweet roasted red peppers, caramelized onions, and garlic come together with a touch of tomato paste and cream for a sauce that’s both comforting and bright. Your new go-to busy weeknight recipe.
- Total Time: 40
- Yield: 4 servings
Ingredients
3 medium red peppers (420g), cut into large slices
1 medium sweet white onion (230g), cut into wedges
8 garlic cloves
Olive oil and kosher salt for roasting, as needed
10 oz (255g) penne rigate or tube-shaped pasta
1 tablespoon butter or olive oil
½ cup (110ml) cashew milk or creamy milk
¼ cup (45ml) pasta water
1 tablespoon tomato paste
1 tablespoon dried oregano
1 teaspoon red pepper flakes
1 teaspoon kosher salt, plus more as needed
Finely grated parmesan or nutritional yeast for serving
Instructions
1. Preheat and Prep — Set your oven to 450°F and line a baking sheet with parchment paper.
2. Roast the Veggies — Toss red peppers, onion, and garlic with olive oil and salt. Roast for 25–30 minutes until slightly charred.
3. Cook the Pasta — While the veggies roast, cook pasta according to package directions. Reserve ¼ cup of pasta water before draining.
4. Blend the Sauce — Combine roasted veggies, cashew milk, pasta water, tomato paste, oregano, red pepper flakes, and salt in a blender. Blend until completely smooth and creamy, at least 2–3 minutes for a velvety texture.
5. Combine and Serve — Pour sauce over pasta, heat gently, and stir until the sauce clings. Adjust seasoning and top with parmesan or nutritional yeast.
Notes
Don’t rush the roast — Let the peppers and onions get nicely charred for the best flavor. This step is key to developing that deep, sweet taste.
Reserve your pasta water — That starchy water helps the sauce cling to the pasta and creates a silky texture. Never skip this step!
Taste as you go — Adjust salt and red pepper flakes to your preference. You can always add more, but you can’t take it away.
Blend until ultra-smooth — For the creamiest sauce, blend for at least 2–3 minutes. You want it totally velvety.
Make it vegan: Use olive oil instead of butter and nutritional yeast in place of parmesan for a fully dairy-free version.
Variations: Add a teaspoon of smoked paprika for a subtle smoky flavor. Stir in sautéed spinach, mushrooms, or zucchini for extra nutrition and color. Toss in grilled chicken or shrimp for a heartier meal.
- Prep Time: 10
- Cook Time: 30
- Category: Dinner
- Method: Roasting / Blender / Stovetop
- Cuisine: Italian / Mediterranean