Getting a perfect crust on filet mignon in cast iron starts with patting the steak completely dry. If you’ve ever wondered how to cook filet mignon cast iron style, you are in the right place. This method gives you a restaurant-quality sear with a tender, juicy center. No fancy equipment needed, just a good pan and a few simple steps.
Filet mignon is a lean cut, so it can dry out fast. Cast iron holds heat like no other pan, making it ideal for a quick, hot sear. You get a deep brown crust without overcooking the inside. Let’s break down exactly how to do it.
Why Cast Iron Works Best For Filet Mignon
Cast iron skillets are heavy and retain heat extremely well. When you drop a cold steak into a hot pan, the temperature drops. Cast iron recovers fast, keeping that sizzle going. This is key for a good sear.
Other pans, like non-stick, can’t handle the high heat needed. Stainless steel works, but cast iron gives you more even heat distribution. Plus, it adds a bit of iron to your food, which is a bonus.
How To Cook Filet Mignon Cast Iron
This is the core section you came for. Follow these steps exactly, and you will nail it every time. The key is prep and patience.
Step 1: Choose The Right Steak
Look for filets that are at least 1.5 inches thick. Thinner steaks cook too fast and are hard to get a good crust without overcooking. Aim for 2 inches if you can find them.
- USDA Prime or Choice grade is best.
- Look for even marbling, even though filet is lean.
- Ask your butcher to cut it fresh for you.
Step 2: Dry And Season The Steak
Pat the steak dry with paper towels. This is the most important step. Moisture is the enemy of a good crust. Let it sit uncovered in the fridge for an hour if you have time. This dries the surface even more.
Season generously with kosher salt and fresh cracked black pepper. Use about 1 teaspoon of salt per pound of meat. Do not use table salt, it’s too fine and can make it salty.
Step 3: Preheat Your Cast Iron Pan
Place your cast iron skillet on the stove over medium-high heat. Let it heat for at least 5 minutes. You want it screaming hot. A drop of water should dance and evaporate instantly.
Add a high smoke point oil like avocado oil or grapeseed oil. Do not use olive oil, it will burn. Swirl the oil to coat the bottom of the pan.
Step 4: Sear The Filet Mignon
Place the steak in the pan away from you to avoid oil splatter. It should sizzle loudly. Do not move it. Let it sear for 3-4 minutes without touching it.
Use tongs to flip it. You should see a deep golden-brown crust. Sear the other side for another 3-4 minutes. For a 1.5-inch steak, this gives you medium-rare.
Step 5: Add Butter And Aromatics
Turn the heat down to medium. Add 2 tablespoons of butter, a few crushed garlic cloves, and a sprig of fresh thyme or rosemary. Tilt the pan slightly and use a spoon to baste the steak with the melted butter.
Baste for about 1 minute. This adds flavor and helps the crust get even better. The butter will brown and smell nutty.
Step 6: Check The Temperature
Use an instant-read thermometer for accuracy. Insert it into the thickest part of the steak. For medium-rare, aim for 130-135°F. For medium, go for 140-145°F.
- Rare: 120-125°F
- Medium-Rare: 130-135°F
- Medium: 140-145°F
- Medium-Well: 150-155°F
- Well Done: 160°F+
Step 7: Rest The Steak
Transfer the steak to a cutting board or plate. Do not cut it yet. Let it rest for 5-7 minutes. Resting allows the juices to redistribute. If you cut too soon, all the juice runs out.
Cover loosely with foil to keep it warm. The internal temperature will rise about 5 degrees during resting, so pull it off the heat a few degrees early.
Common Mistakes When Cooking Filet Mignon In Cast Iron
Even experienced cooks mess up sometimes. Here are the most common errors and how to avoid them.
Using A Cold Steak
Let the steak sit at room temperature for 20-30 minutes before cooking. A cold steak will drop the pan temperature too much, leading to a weak sear. It also cooks unevenly.
Overcrowding The Pan
Cook only one or two steaks at a time. If you put too many in the pan, they steam instead of sear. Work in batches if needed. Keep the cooked steaks warm in a low oven.
Moving The Steak Too Early
Resist the urge to poke or flip the steak early. Let it develop a crust naturally. If it sticks, it’s not ready to flip. It will release when the crust forms.
Not Using Enough Oil
You need a thin layer of oil to ensure even contact with the pan. Too little oil causes sticking and uneven browning. Use about 1-2 tablespoons for a 12-inch pan.
How To Season Your Cast Iron Pan For Best Results
A well-seasoned pan is non-stick and gives you a better sear. If your pan is new or looks dull, season it first.
- Wash the pan with soap and water, then dry it completely.
- Rub a thin layer of vegetable oil or flaxseed oil all over the pan, inside and out.
- Place it upside down in a 450°F oven for 1 hour. Put a baking sheet on the rack below to catch drips.
- Let it cool in the oven. Repeat this 2-3 times for a good seasoning.
After cooking, clean the pan with hot water and a stiff brush. Do not use soap. Dry it on the stove over low heat, then rub a tiny bit of oil on the surface.
What To Serve With Cast Iron Filet Mignon
Filet mignon is rich and tender, so pair it with simple sides. You don’t want to overpower the steak’s flavor.
- Roasted asparagus or green beans
- Garlic mashed potatoes
- A simple arugula salad with lemon vinaigrette
- Sauteed mushrooms with thyme
- Crusty bread to soak up the pan juices
Frequently Asked Questions
Can I cook filet mignon from frozen in cast iron?
It’s not recomended. Frozen steak will cook unevenly and won’t get a good crust. Thaw it in the fridge overnight for best results.
How long do I cook a 2-inch filet mignon in cast iron?
For medium-rare, sear 4-5 minutes per side, then finish in a 400°F oven for 5-7 minutes. Use a thermometer to be sure.
Do I need to oil the steak or the pan?
Oil the pan, not the steak. Oil on the steak can burn and smoke. A thin layer of oil in the hot pan is all you need.
What is the best oil for searing filet mignon?
Avocado oil, grapeseed oil, or refined coconut oil work best. They have high smoke points and neutral flavors.
Can I use butter instead of oil for searing?
Butter burns at high heat. Use oil for the initial sear, then add butter at the end for basting. This gives you the best of both worlds.
Final Tips For Perfect Filet Mignon Every Time
Practice makes perfect. The first time you try this method, it might not be perfect. That’s ok. Take notes on timing and temperature.
Invest in a good instant-read thermometer. It takes the guesswork out of cooking steak. Thermapen is a popular choice, but any reliable brand works.
Let the steak rest. I know it’s hard to wait, but it makes a huge difference. A rested steak is jucier and more tender.
If you want a thicker crust, try dry-brining. Salt the steak and leave it uncovered in the fridge for 12-24 hours. This draws out moisture and seasons the meat deeply.
Clean your cast iron pan right after cooking. While it’s still warm, rinse with hot water and scrub with a brush. Dry it on the stove and rub with a little oil. This keeps it non-stick for years.
You now know exactly how to cook filet mignon cast iron style. It’s a simple process that delivers amazing results. Go ahead and try it tonight. Your taste buds will thank you.