Caramelized Onion Pasta
Three onions cooked to sweet amber tangled through pasta with parmesan — patience, rewarded.
Ingredients
- 3 Onion
- 200 g Pasta
- 30 g Butter
- 40 g Hard cheese
- 1 tsp Salt
- 1 tsp Thyme (optional)
- 1 tsp Balsamic vinegar (optional)
- ½ tsp Black pepper (optional)
Method
- Halve the onions through the root and slice them into thin half-moons.
- Melt the butter in a wide pan over medium-low heat.
- Add the onions with a pinch of the salt and the thyme and stir to coat.
- Cook the onions low and slow, stirring every few minutes and adding a splash of water if they catch, until deep amber and jammy.
- Bring a pot of well-salted water to a boil for the pasta.
- Boil the pasta one minute shy of al dente.
- Reserve a mug of pasta water, then drain.
- Stir the balsamic into the caramelized onions and let it cook off for 30 seconds. (optional)
- Toss the drained pasta through the onions with splashes of pasta water until a silky sauce coats every strand.
- Take the pan off the heat and stir in the grated hard cheese.
- Plate the pasta with black pepper and a little more cheese on top.
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About Caramelized Onion Pasta
Caramelized onion pasta is a study in transformation: three onions cooked low and slow until they collapse into a sweet, jammy amber tangle, then tossed through pasta with butter and a hard grating cheese. There is nothing complicated in the ingredient list, and that's exactly the point, the flavor is built almost entirely from patience. Cooking the onions gently for a long stretch, adding a splash of water whenever they threaten to catch, converts their raw sharpness into deep, mellow sweetness. A hit of balsamic at the end and a handful of thyme keep that sweetness from becoming one-note.
The result is a comforting, deeply savory bowl where the onions read almost like a sauce, silky and rich, clinging to the noodles with the help of a little starchy pasta water and melted cheese. It's the kind of unfussy weeknight dinner that tastes far more involved than its short ingredient list suggests, warming and satisfying without any cream or meat. The forty-five-minute time is mostly hands-off caramelizing, so it suits an evening when you want to potter around the kitchen. The essential discipline is resisting the urge to rush the onions with high heat, which browns them unevenly and skips the slow sweetness that makes the dish.
Caramelized Onion Pasta: frequently asked questions
How many calories are in Caramelized Onion Pasta?
A serving has about 629 calories — 22.4g protein, 92.2g carbs, 18.9g fat, 6.7g fiber. Figures are estimated from the ingredient amounts and will shift with your portions and brands.
Is Caramelized Onion Pasta gluten-free?
As written, no — it contains Pasta. You'd need a certified gluten-free swap for that ingredient to make it gluten-free.
Is Caramelized Onion Pasta dairy-free?
Not as written — it uses Butter. Swapping it for a plant-based alternative makes it dairy-free.
Do I need every ingredient to make Caramelized Onion Pasta?
The core ingredients are essential, but you can leave out thyme, balsamic vinegar, black pepper — they're optional and mainly there for extra flavor or finish.
How many servings does Caramelized Onion Pasta make?
This recipe makes 2 servings. In the app you can scale it up or down and the ingredient amounts adjust automatically.