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Spaghetti Lyonnaise Au Gratin: A Hearty Comfort Food Classic

The aroma of caramelized onions always takes me back to my grandmother’s kitchen. She wasn’t fancy, but she knew how to make magic with simple ingredients. I remember one particularly chilly autumn evening, she whipped up this very dish, a bubbling, cheesy creation that warmed us from the inside out. The sweetness of the onions mingling with the savory spaghetti and that gloriously browned cheese topping – it was pure, unadulterated comfort. It’s a recipe I’ve cherished and adapted over the years, a little piece of my past I’m delighted to share with you.

Recipe Overview

Prep Time: 10 minutes
Cook Time: 25 minutes
Total Time: 35 minutes
Servings: 4
Yield: 1 gratin
Dietary Type: Vegetarian

Ingredients

900 ml salt water
250 g spaghetti, broken
2 medium onions, chopped
2 teaspoons cornflour
1⁄2 teaspoon nutmeg, grated
1⁄2 teaspoon pepper
2 tablespoons cold water
150 ml evaporated milk
75 g cheese, grated (Stilton recommended for a strong flavour, but cheddar, Gruyère, or your favorite cheese will work)
2 tablespoons rolled oats
Chopped parsley or chives, for garnish (optional)

Equipment Needed

Large saucepan
Small bowl
Oven-proof dish (casserole dish)

Instructions

Begin by bringing the salt water to a vigorous boil in a large saucepan. This salted water will not only cook the spaghetti but also season it from the inside out.
Once the water is boiling, carefully drop in the broken spaghetti. Breaking the spaghetti makes it easier to manage in the gratin.
After the spaghetti has been cooking for about 5 minutes, add the chopped onions to the saucepan. Continue to cook until the spaghetti is just soft (al dente). Remember, the spaghetti will continue to cook in the oven, so don’t overcook it at this stage. This usually takes another 5-7 minutes.
While the spaghetti and onions are cooking, prepare the sauce. In a small bowl, blend together the cornflour, grated nutmeg, and pepper with the cold water until you have a smooth paste. This prevents lumps from forming when you add the milk.
Next, whisk in the evaporated milk to the cornflour mixture until everything is well combined.
Once the spaghetti is cooked to al dente, and the onions are softened, pour the evaporated milk mixture into the saucepan with the spaghetti and onions.
Bring the mixture to a gentle boil, stirring constantly to prevent sticking, and cook for a further minute, allowing the sauce to thicken slightly. The sauce should be just thick enough to coat the spaghetti.
Carefully pour the spaghetti and onion mixture into a preheated oven-proof dish. A casserole dish works perfectly for this.
Evenly sprinkle the grated cheese over the top of the spaghetti.
Scatter the rolled oats over the cheese. The rolled oats will add a lovely textural crunch to the top of the gratin.
Place the dish under a preheated grill until the cheese is melted, bubbly, and the top is nicely browned. Keep a close eye on it, as it can burn quickly.
Remove from the grill and allow to cool slightly before serving.

Expert Tips & Tricks

Caramelizing the Onions: For a deeper, richer flavor, consider caramelizing the onions separately before adding them to the spaghetti. Sauté them in butter over low heat until they are golden brown and sweet. This adds an extra layer of complexity to the dish.
Cheese Choice: Experiment with different cheeses to find your favorite combination. Gruyère adds a nutty flavor, while a sharp cheddar provides a tangy kick. A blend of cheeses can also be used.
Make-Ahead Option: You can prepare the spaghetti and onion mixture ahead of time and store it in the refrigerator for up to 24 hours. When you’re ready to bake, simply pour it into the oven-proof dish, top with cheese and oats, and grill as directed.
Preventing a Soggy Bottom: To avoid a soggy bottom, ensure the spaghetti is not overly wet before adding it to the oven-proof dish. You can drain the spaghetti well or even toss it with a little olive oil before adding the sauce.
Adding a Touch of Heat: For a little kick, add a pinch of red pepper flakes to the cornflour mixture.

Serving & Storage Suggestions

Serve the Spaghetti Lyonnaise Au Gratin hot, straight from the grill. Garnish with freshly chopped parsley or chives for a pop of color and fresh flavor. This dish is delicious on its own or alongside a crisp green salad.

Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. To reheat, microwave until heated through or bake in a preheated oven at 350°F (175°C) until warmed through. You may need to add a splash of milk or water to prevent it from drying out. While freezing is possible, the texture of the pasta and sauce may change upon thawing. It’s best enjoyed fresh or within a few days.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	418.3 kcal	N/A
Calories from Fat	81 g	20%
Total Fat	9.1 g	13%
Saturated Fat	5 g	25%
Cholesterol	23.6 mg	7%
Sodium	230.8 mg	9%
Total Carbohydrate	66.9 g	22%
Dietary Fiber	3.7 g	14%
Sugars	4.3 g	17%
Protein	16.8 g	33%

Note: Nutritional information is an estimate and may vary based on specific ingredients and preparation methods.

Variations & Substitutions

Gluten-Free Version: Use gluten-free spaghetti and ensure the rolled oats are certified gluten-free.
Dairy-Free Version: Substitute the evaporated milk with your favorite plant-based milk (such as oat or almond milk) and use a dairy-free cheese alternative. Be mindful that dairy-free cheeses may not melt the same way as traditional cheese.
Vegetable Boost: Add other vegetables, such as mushrooms, bell peppers, or zucchini, to the onion mixture for extra nutrients and flavor.
Herby Twist: Incorporate fresh herbs like thyme or rosemary into the spaghetti and onion mixture for an aromatic twist.
Spice it Up: Add a pinch of cayenne pepper or a dash of hot sauce to the sauce mixture for a little heat.

FAQs (Frequently Asked Questions)

Q: Can I use regular milk instead of evaporated milk?

A: Yes, you can use regular milk, but the sauce might not be as thick. If using regular milk, consider adding an extra teaspoon of cornflour to help thicken it.

Q: Can I make this dish ahead of time and freeze it?

A: While you can freeze it, the texture of the spaghetti and sauce may change upon thawing. It’s best enjoyed fresh or within a few days of making it.

Q: What if I don’t have rolled oats?

A: If you don’t have rolled oats, you can use breadcrumbs or simply omit them. The rolled oats add a nice crunch, but they are not essential to the recipe.

Q: Can I use a different type of cheese?

A: Absolutely! Feel free to experiment with different cheeses to find your favorite flavor combination. Cheddar, Gruyère, and mozzarella are all great options.

Q: How do I prevent the top from burning under the grill?

A: Keep a close eye on the gratin while it’s under the grill. If the top starts to brown too quickly, move the dish further away from the heat source or cover it loosely with foil.

Final Thoughts

I truly hope you’ll give this Spaghetti Lyonnaise Au Gratin a try. It’s a simple yet satisfying dish that’s perfect for a cozy night in or a casual gathering with friends. Don’t be afraid to experiment with different cheeses and herbs to make it your own. And please, share your creations and feedback – I’d love to hear how it turns out for you! Perhaps pair it with a refreshing glass of white wine or a light side salad for a complete and delightful meal.

Spaghetti Lyonnaise Au Gratin Recipe