Forget everything you thought you knew about onion sauce! We’re slow-cooking sweet red onions until they’re jammy and caramelized, then simmering them in a luxurious bath of red wine, brandy, and fragrant herbs. This isn’t just pasta sauce; it’s a rich, deeply savory experience that transforms a humble ingredient into a five-star vegetarian masterpiece. Get ready for your new favorite comfort food!
Ingredients
• (Serves 6-8)
• 2½ lbs / 1.1 kg red onions
• ½ cup / 113 g butter
• 2 large bay leaves
• 3 cloves garlic, minced
• 1 tsp / 5 g paprika
• ½ tsp / 3 g salt, plus more to taste
• 1 cup / 240 ml good dry red wine
• ¼ tsp / 0.5 g dried thyme
• ¼ tsp / 0.5 g cayenne pepper
• ¼ tsp / 0.5 g dried basil, crushed
• ¼ tsp / 0.5 g dried oregano, crushed
• 1 tsp chopped fresh sage, or ½ tsp dried
• 2 cups / 480 g peeled, chopped tomatoes, with liquid
• ¼ cup / 60 ml brandy
• 1 tsp / 5 ml lemon juice
• 2 tsp / 10 ml white wine vinegar
• Fresh-ground black pepper to taste
• 1¼ to 1½ lbs / 570 to 680 g thin spaghetti
Instructions
1. Prep the onions by peeling, halving, and slicing them rather thickly.
2. Melt the butter in a large, heavy-bottomed pot over medium heat. Add the bay leaves and minced garlic, stirring constantly for about 1 minute until fragrant.
3. Add the sliced onions and increase the heat to medium-high. Sauté, stirring almost constantly, for at least 30 minutes. Be patient; you want the onions to become an even, caramelized light brown color.
4. Stir in the paprika and salt and continue to cook for another 2-3 minutes to toast the spices.
5. Pour in the red wine, scraping up any browned bits from the bottom of the pot. Add the thyme, cayenne, basil, oregano, sage, tomatoes, brandy, lemon juice, vinegar, and a generous amount of black pepper.
6. Reduce the heat to low and let the sauce simmer, stirring occasionally, for 45 to 60 minutes. It should become thick but remain saucy, not pasty.
7. While the sauce simmers, bring 6-7 quarts of generously salted water to a boil. Cook the spaghetti until it is just al dente, then drain it immediately.
8. Taste the sauce and adjust seasoning if necessary. Remember to remove the bay leaves. Pour the hot sauce over the drained spaghetti, toss together quickly to coat, and serve immediately.
Nutritional Information
• A hearty vegetarian meal packed with deep, savory flavor.
• Onions are a good source of vitamin C, B vitamins, and antioxidants.
• Provides complex carbohydrates from the pasta for sustained energy.
• Note: This is an estimate. Actual nutrition will vary based on specific and portion sizes.
Pro Tips
• for Success
• Don’t rush the onion caramelization. The 30+ minutes of slow cooking is what develops the deep, sweet, and savory foundation of the sauce.
• Use a good dry red wine that you would actually drink, like a Merlot or Cabernet Sauvignon. It adds significant depth that a cooking wine can’t match.
• Before draining the spaghetti, reserve about a cup of the starchy cooking water. If your sauce is a bit too thick, add a splash to the final dish to help it emulsify and cling perfectly to the pasta.
• For a richer flavor, consider using a high-quality canned tomato, like San Marzano, and crushing them by hand.
FAQ
Q: Can I make this onion sauce vegan
A: Yes, absolutely! To make this recipe vegan, simply substitute the butter with a high-quality vegan butter or a good olive oil. The rest of the ingredients are naturally plant-based, creating a delicious and rich vegan pasta sauce.
Q: How can I add protein to this vegetarian pasta dish
A: This sauce pairs wonderfully with added protein. For a hearty vegetarian meal, consider stirring in a can of rinsed cannellini beans or chickpeas during the last 10 minutes of simmering. You could also top the finished dish with toasted pine nuts or nutritional yeast for a cheesy, savory boost.
Q: How long does this vegetarian onion sauce last in the fridge
A: This sauce is fantastic for meal prep. Once cooled, it can be stored in an airtight container in the refrigerator for up to 5 days. The flavors will actually deepen and become even more delicious overnight. It also freezes beautifully for up to 3 months.
Q: Is this recipe gluten-free
A: The sauce itself is naturally gluten-free. To make the entire meal gluten-free, simply serve it with your favorite gluten-free spaghetti or pasta. Be sure to check that your brandy and red wine are certified gluten-free if you have a severe intolerance.
