Filet Mignon with Caramelized Onions

Name: Filet Mignon with Caramelized Onions
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 2 servings
Ingredients: 2 filet mignon steaks (6-8 ounces each); Salt and pepper, to taste; 2 tablespoons olive oil; 2 tablespoons unsalted butter; 2 medium onions, thinly sliced; 1 tablespoon olive oil; 1 tablespoon unsalted butter; Salt, to taste; 1 teaspoon sugar (optional)

Highlighted under: International Dish Inspirations

I absolutely love crafting the perfect filet mignon, especially when I pair it with sweet, caramelized onions. The combination of a juicy steak and the rich, savory flavor of the onions creates an unforgettable dish that's ideal for special occasions. While the technique may seem intimidating, I’ve found that taking the time to perfectly sear the steak and patiently caramelize the onions is what really elevates this recipe. Join me in creating a restaurant-quality meal right in your own kitchen in just a couple of simple steps!

Created by

Tina

Last updated on 2026-01-22T14:14:29.291Z

Every time I cook filet mignon, I remember the first time I was taught how to properly prepare this luxurious cut of beef. The trick lies in achieving a perfect sear on the outside while keeping the center tender and juicy. I’ve discovered that letting the meat rest after cooking is essential, as it allows the juices to redistribute, resulting in a mouthwatering bite with each slice.

When it comes to caramelizing onions, patience is key. I start with medium heat and allow them to slowly cook down, stirring occasionally. This develops their natural sweetness and deep flavor. It's a simple technique that adds a gourmet touch to the dish, transforming an already delicious steak into a standout meal.

Why You Will Love This Recipe
Rich, buttery steak flavor complemented by sweet caramelized onions.
Elevates a weeknight dinner to a special occasion.
Perfectly balanced flavors and textures that delight your palate.

The Art of Caramelizing Onions

Caramelizing onions is a technique that requires patience and attention. Start by choosing good-quality onions, such as yellow or sweet onions, which have the right sugar content to achieve that golden-brown color. The key is to cook them over medium heat, allowing them to become soft and translucent before they start to caramelize. Stir the onions occasionally, being careful not to let them stick to the pan, which can cause uneven cooking.

For optimal results, consider covering the skillet for the first few minutes. This traps steam and helps the onions soften faster. Once they start to turn golden, reduce the heat slightly to avoid burning. If you’re looking to enhance the sweetness, the optional teaspoon of sugar works wonders when added halfway through the cooking process, intensifying the rich flavor profile.

Perfecting Your Filet Mignon

Selecting the right filet mignon is crucial for achieving that buttery texture. Look for steaks that are bright red with good marbling, as this indicates quality and tenderness. Before cooking, taking the steak out of the refrigerator allows it to come to room temperature, ensuring even cooking. Season generously with salt and pepper to enhance the natural flavors of the meat.

When searing filet mignon, ensure that your skillet is preheated until it’s shimmering, which indicates it’s hot enough to create a delicious crust. Avoid overcrowding the pan; cooking one or two steaks at a time helps maintain the temperature. As you baste with butter during the last few minutes, tilt the pan to gather the melted butter and spoon it over the steak. This not only adds flavor but also aids in achieving a beautiful crust.

Ingredients

Gather these ingredients before starting your cooking process.

For the Filet Mignon

2 filet mignon steaks (6-8 ounces each)
Salt and pepper, to taste
2 tablespoons olive oil
2 tablespoons unsalted butter

For the Caramelized Onions

2 medium onions, thinly sliced
1 tablespoon olive oil
1 tablespoon unsalted butter
Salt, to taste
1 teaspoon sugar (optional)

Cooking Steps

Follow these steps to create a delicious filet mignon with caramelized onions.

Caramelize the Onions

In a skillet over medium heat, add olive oil and butter. Once melted, add the sliced onions and a pinch of salt. Cook slowly, stirring occasionally, for about 15-20 minutes, until the onions are golden brown and soft. If desired, sprinkle in the sugar to enhance the caramelization.

Prepare the Filet Mignon

While the onions are cooking, season the filet mignon generously with salt and pepper. In a separate skillet, heat olive oil over high heat until shimmering. Add the steaks and sear for about 4-5 minutes per side for medium-rare, reducing heat if necessary. Add butter in the last few minutes to baste the steaks.

Serve

Once cooked to your liking, remove the filet mignon from the skillet and allow it to rest for 5 minutes. Serve the steaks topped with generous portions of caramelized onions.

Pro Tips

For an extra depth of flavor, consider adding a splash of balsamic vinegar to the onions during the last few minutes of cooking.

Serving Suggestions

To elevate your plate, consider pairing the filet mignon with a side of roasted or sautéed vegetables. Asparagus or green beans tossed with lemon and garlic provide a fresh contrast to the rich steak and sweet onions. A light salad with a tangy vinaigrette can also bring balance to the meal, reinforcing the savory experience of the steak without overwhelming it.

Another serving idea is to create a steak sandwich using leftovers. Thinly slice the filet mignon and pile it onto a crusty baguette with arugula and a smear of creamy horseradish sauce. This transforms your elegant dinner into a gourmet lunch the next day, showcasing the versatile nature of these flavors.

Storage and Reheating Tips

If you have leftover steak or caramelized onions, store them separately in airtight containers in the refrigerator. The steak will remain good for 3-4 days, while the onions can last up to a week. When reheating, do so gently to maintain the steak’s tenderness. I recommend using a skillet over low heat, adding a splash of broth or water to keep it moist.

Caramelized onions can also be frozen for extended storage. Spread them in a single layer on a baking sheet, freeze until solid, and then transfer to a freezer bag. They can be reheated directly from frozen, making them a convenient addition to future meals, whether in pasta dishes, on pizzas, or as a topping for burgers.

Questions About Recipes

→ Can I use other cuts of meat?

Yes, while filet mignon is the best choice for tenderness, you can also use ribeye or sirloin if you prefer.

→ How can I tell when the steak is done?

Use a meat thermometer! For medium-rare, aim for an internal temperature of about 130°F (54°C).

→ What should I serve with this dish?

Roasted vegetables, mashed potatoes, or a simple green salad pair wonderfully with this steak.

→ Can I make the caramelized onions ahead of time?

Absolutely! They can be made ahead and stored in the fridge for up to a week. Just reheat gently before serving.