1. Begin by thinly slicing your onions. This might take a little time, but the effort is well worth it.
2. Add the sliced onions to your slow cooker, followed by the olive oil or butter, salt, and optional sugar. Stir to combine well.
3. Cover and cook on low for about 8-10 hours, stirring occasionally, until the onions are deeply golden and caramelized.
4. About 30 minutes before the onions are done, stir in the minced garlic, thyme, rosemary, and white wine or vegetable broth. Continue cooking until the mixture is aromatic and well combined.
5. Meanwhile, cook your pasta according to the package directions. Reserve a cup of the starchy pasta water before draining.
6. Combine the caramelized onions with the cooked pasta, adding reserved pasta water as needed to create a silky sauce.
7. Stir in the grated Parmesan cheese and season with salt and pepper to taste.
8. Garnish with freshly chopped parsley and serve immediately.
Variations & Tips
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