Garlic Butter Steak Sandwich with Motley Mustard Aioli

Garlic Butter Steak Sandwich with Motley Mustard Aioli

Looking for the best steak sandwich recipe? This Garlic Butter Steak Sandwich is loaded with juicy, perfectly seared steak, sweet caramelized onions, melted provolone, and a creamy Motley Mustard aioli, all tucked into a fresh ciabatta bun.

The secret to big flavour starts with a generous coating of Motley Que Steak Fixx, followed by a hot sear in Garlic Butter Grillin' Oil to create an incredible crust. Finished with a tangy Motley Mustard Aioli, this sandwich delivers steakhouse flavour right from your own kitchen.

Whether you're firing up the grill for the long weekend or looking for an easy weeknight dinner, this steak sandwich is guaranteed to earn a spot in your regular rotation.

 

Why You'll Love This Steak Sandwich

  • Steak Fixx creates a bold, steakhouse-inspired crust.
  • Garlic Butter Grillin' Oil adds rich buttery garlic flavour.
  • Motley Mustard Aioli delivers the perfect tangy finish.
  • Caramelized onions and melted provolone take every bite over the top.
  • Ready in about 40 minutes.

Ingredients

Steak Sandwich

  • 1½ lb sirloin, striploin, or ribeye steak
  • 2-3 tbsp Motley Que Steak Fixx
  • 2 tbsp Motley Que Garlic Butter Grillin' Oil
  • 2 large yellow onions, thinly sliced
  • 4 ciabatta buns
  • 8 slices provolone cheese

Motley Mustard Aioli

  • ½ cup mayonnaise
  • 2 tbsp Motley Que Motley Mustard
  • 1 clove garlic, finely minced
  • 1 tsp lemon juice
  • 1 tsp Worcestershire sauce
  • Fresh cracked black pepper

Instructions

1. Caramelize the Onions

Heat 1 tablespoon of Motley Que Garlic Butter Grillin' Oil in a large skillet over medium-low heat.

Add the sliced onions and cook, stirring occasionally, for 25 to 30 minutes until they're soft, deep golden brown, and beautifully caramelized.

2. Make the Motley Mustard Aioli

In a small bowl, combine:

  • Mayonnaise
  • Motley Mustard
  • Garlic
  • Lemon juice
  • Worcestershire sauce
  • Black pepper

Mix until smooth and refrigerate while preparing the sandwich.

3. Season the Steak

Pat the steak dry with paper towel.

Generously coat both sides with Motley Que Steak Fixx, pressing the seasoning into the meat to create a flavourful crust.

Allow the steak to sit at room temperature for 20 to 30 minutes before cooking.

4. Sear the Steak

Heat a cast iron skillet over high heat until smoking hot.

Add the remaining Garlic Butter Grillin' Oil, then sear the steak for 3 to 4 minutes per side, depending on thickness and your preferred doneness.

Transfer to a cutting board and let the steak rest for 5 to 10 minutes before slicing thinly against the grain.

5. Toast the Ciabatta

Slice the ciabatta buns in half.

Lightly brush the cut sides with Garlic Butter Grillin' Oil and toast until lightly golden.

6. Build the Sandwich

Spread a generous layer of Motley Mustard Aioli on both halves of each bun.

Layer with:

  • Sliced steak
  • Provolone cheese
  • Warm caramelized onions

If desired, place the assembled sandwiches under the broiler for 1 to 2 minutes to melt the cheese even further.

Serve immediately.

Tips for the Best Steak Sandwich

  • Season generously with Steak Fixx for maximum flavour and a beautiful crust.
  • Slice the steak against the grain for the most tender bite.
  • Ribeye offers the richest flavour, while sirloin is an excellent everyday option.
  • Let the steak rest before slicing to keep every bite juicy.
  • Toasting the ciabatta adds texture and helps hold everything together.

What to Serve with Garlic Butter Steak Sandwiches

This sandwich pairs perfectly with:

  • Crispy French fries
  • Garlic parmesan potato wedges
  • Kettle chips
  • Creamy coleslaw
  • Grilled corn on the cob
  • Dill pickles

Frequently Asked Questions

What is the best steak for steak sandwiches?

Ribeye, striploin, and sirloin all work beautifully. Ribeye is the richest and most tender, while sirloin offers outstanding flavour and value.

Can I grill the steak instead of using a cast iron skillet?

Absolutely. Season generously with Steak Fixx, grill over high heat until your desired doneness, then rest before slicing thinly.

Can I make the Motley Mustard Aioli ahead of time?

Yes. Prepare it up to three days in advance and keep it refrigerated until you're ready to assemble the sandwiches.

More Motley Que Recipes

If you loved this Garlic Butter Steak Sandwich, explore more recipes featuring Steak Fixx, Garlic Butter Grillin' Oil, and Motley Mustard. From backyard BBQs to weeknight dinners, Motley Que products are built to make every cook simple, bold, and packed with flavour.

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