Alright, let’s get this out of the way — I ruined this dish the first time I made it. I scorched the Cognac, overcooked the steak, and served it on a chipped plate like it was penance. I thought, “How hard can a James Martin fillet steak really be?” Well, apparently, a bit harder than shouting yes chef! at the telly.
The thing is, fillet steak isn’t just about tossing meat in a pan and pouring sauce over it. It’s finesse. It’s timing. It’s the delicate line between creamy and claggy, flambéed and singed. But once you get it right — oh, it’s absolutely worth it. That pink peppercorn Cognac sauce? It’s dinner-party showstopper stuff.
Let’s cook this properly — so you don’t end up standing in your kitchen muttering regrets into your mashed potatoes like I did.
And yes, we’ll be doing a proper James Martin fillet steak — not a weeknight hack. Let’s do it right.
Ingredients List
- 4 medium potatoes (about 400g), roughly diced
Rustic cuts = better texture. - 3 tablespoons olive oil
Helps crisp the potatoes — don’t skimp. - 3 garlic cloves, crushed
Infuses everything with warmth. - 2 x 175g fillet steaks
Use quality aged steaks if you can. - 25g unsalted butter
For basting. Makes the steak sing. - 2 shallots, finely diced
- 25ml Cognac
Just enough to kiss the pan, not drown it. - 3 teaspoons pink peppercorns, crushed
Gives the sauce that fruity fire. - 100ml beef stock
- 150ml double cream
- 1 teaspoon Dijon mustard
- Small bunch of flat-leaf parsley, chopped
- Sea salt and freshly ground black pepper
How To Make It (Instructions)
- Heat a non-stick frying pan on medium.
Add 2 tbsp olive oil, then the diced potatoes and crushed garlic.
Let them crisp up, tossing every so often for 15–20 minutes. - Meanwhile, rub the steaks with the remaining olive oil.
Get a second pan blazing hot. - Cook steaks 2–3 minutes per side for medium-rare.
Add another 1–2 minutes per side for medium. Don’t move them too much — let that crust form. - Drop in half the butter.
Baste the steaks with it for a minute. The smell? That’s your neighbours peeking over the fence. - Remove steaks, rest on a warm plate, juices and all.
Don’t skip resting — it’s not optional. It’s sacred. - Back to the hot pan — add the rest of the butter.
Once foaming, toss in the shallots. Sauté until golden, 3–4 minutes. - Add the Cognac — and here’s the risky bit.
Tip the pan slightly and let it flambé. (Stand back. I’m serious. I lost half an eyebrow once.) - Add the pink peppercorns and cook 2 more minutes.
Then stir in the beef stock and bring it up to a lively bubble. - Whisk in the mustard and cream.
Simmer gently. Season to taste — go easy, taste often. - Toss chopped parsley into the now-crispy potatoes.
Turn off the heat and let the scent fill the kitchen. - Plate the steaks, top with sauce, and scatter potatoes on the side.
No garnish needed — this dish speaks for itself.

Common Mistakes
Why is my sauce too runny?
You didn’t simmer it long enough. Let it reduce slowly until it coats the back of a spoon.
Why is my steak grey inside?
You overcooked it. Fillet needs love — and a timer.
Why does my Cognac sauce taste bitter?
Burned the alcohol. Either too much heat or didn’t flame it off properly. I did this once and thought I’d poisoned myself.
Do I have to flambé the Cognac?
You should — it burns off the harshness and leaves depth. But if you’re nervous, let it simmer gently for an extra minute instead.
Can I use black pepper instead of pink?
Technically yes. But pink brings a floral note that black just doesn’t match.
Storage And Reheating Tips
Fridge:
Store leftover steak and potatoes separately in airtight containers. They’ll keep for 3–4 days max.
Freezer:
Wrap the cooked steak tightly in foil or a freezer bag. Label and freeze up to 3 months. Same with the potatoes (though they lose a bit of crisp).
Reheating:
- Oven: Wrap steak in foil and warm at 175°C for 10–15 minutes.
- Stovetop: Sear gently with butter on medium-low — don’t blast it.
- Sous Vide: Reheat in a 54°C water bath for 30 minutes. Best method if you ask me.
What To Serve With It
- Sautéed mushrooms: They soak up that sauce like sponges of the gods.
- Green beans with almonds: Fresh crunch meets richness.
- A bold red wine: A Côtes du Rhône or Rioja holds up to the sauce beautifully.
FAQ Section
Can I make this gluten-free?
Yes — just ensure your mustard, stock, and Cognac are gluten-free. The rest is naturally safe.
What’s the best cut of beef for this if I can’t find fillet?
Sirloin or rump steak will work. Ribeye has more fat, so it changes the character — still tasty, just richer.
Do I have to use Cognac?
No, brandy works fine. Even whisky in a pinch, though it’ll taste smokier.
Can I prep any parts ahead?
You can pre-dice the potatoes and shallots, crush the peppercorns, and even mix the cream and mustard in advance.
Try More Recipes:

James Martin Fillet Steak
Description
Tender fillet steak with a creamy Cognac peppercorn sauce, served alongside golden garlic potatoes for a restaurant-quality meal.
Ingredients
Instructions
- Heat 2 tbsp olive oil in a pan over medium. Add potatoes and garlic. Cook 15–20 mins, stirring occasionally.
- Rub steaks with 1 tbsp olive oil. Sear in a hot pan, 2–3 mins each side for medium-rare.
- Add half the butter. Baste steaks 1 min. Remove and rest.
- Add remaining butter to steak pan. Cook shallots 3–4 mins.
- Add Cognac, flambé carefully. When flame dies, add peppercorns. Cook 2 mins.
- Stir in beef stock, bring to boil. Add cream and mustard. Simmer. Season.
- Toss parsley into cooked potatoes. Plate with steak and spoon over sauce.