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This Blackstone Griddle Steak Sandwich is one of those meals that looks restaurant-worthy but is incredibly easy to make at home. Tender, juicy ribeye steak is cooked right on the Blackstone with caramelized grilled onions, then piled onto toasted bread with homemade basil pesto and a drizzle of steak sauce.

The combination is so good. You get the richness of the ribeye, sweetness from the grilled onions, freshness from the basil pesto, and that tangy steak sauce that ties everything together.

If you're looking for another easy dinner to add to your Easy Blackstone griddle recipes, this steak sandwich needs to be on the list!

Why You'll Love This Blackstone Griddle Steak Sandwich

One of my favorite things about cooking on the Blackstone is that I can make the entire meal in one place. The steak cooks beautifully on the hot griddle while the onions caramelize beside it, and you can even toast the bread before assembling your sandwiches.

Here's why you'll love this recipe:

• Perfect for steak lovers. Ribeye has plenty of marbling, making it incredibly juicy and flavorful.
• Easy Blackstone dinner. Everything cooks right on the griddle.
• Homemade basil pesto adds tons of flavor. The fresh basil and garlic are delicious with steak.
• Easy to customize. Add cheese, mushrooms, peppers, or your favorite sandwich toppings.
• Great way to use leftover steak. If you have leftover grilled ribeye, this sandwich comes together even faster.

Ingredients for a Blackstone Griddle Steak Sandwich

You don't need many ingredients to make an amazing steak sandwich.

• Ribeye steaks
• Salt
• Black pepper
• Garlic powder, optional
• Large onion, sliced
• Butter or oil for the griddle
• Homemade basil pesto
• Steak sauce
• Hoagie rolls, ciabatta rolls, or your favorite sandwich bread

Ribeye is my favorite choice because the marbling keeps the steak tender and juicy. However, you could also make these sandwiches with sirloin, New York strip, or even leftover steak.

How to Make a Steak Sandwich on the Blackstone Griddle

Step 1: Preheat the Blackstone

Preheat your Blackstone griddle to medium-high heat. Add a little oil to the cooking surface.

While the griddle heats, season the ribeye steaks generously with salt and black pepper. You can also sprinkle them with a little garlic powder if you like.

Step 2: Grill the Onions

Add the sliced onions to the griddle with a little butter or oil.

Cook the onions, stirring occasionally, until they're tender and nicely caramelized. Depending on how soft and browned you like them, this will usually take around 8 to 12 minutes.

Move the onions to a cooler section of the Blackstone while you cook the steak.

Step 3: Cook the Ribeye

Place the ribeye steaks on the hot griddle.

Let them cook without moving them around too much so they develop a beautiful crust. Flip and continue cooking until the steaks reach your preferred level of doneness.

For food safety, USDA guidance recommends cooking whole cuts of beef to at least 145°F followed by a 3-minute rest.

Remove the steaks from the griddle and allow them to rest for several minutes before slicing. Resting helps keep all those delicious juices inside the meat.

Slice the ribeye thinly against the grain.

Step 4: Toast the Bread

Cut your sandwich rolls in half and place them cut-side down on the Blackstone.

Toast for a minute or two until they're lightly golden and crisp around the edges.

This little step makes a big difference because the toasted bread holds up better to the juicy steak and pesto.

Step 5: Assemble the Steak Sandwiches

Now comes the best part!

Spread a generous layer of homemade basil pesto over the toasted bread. Add plenty of sliced ribeye and top it with the grilled onions.

Finish everything with a drizzle of your favorite steak sauce.

Add the top half of the bread and serve while everything is still warm.

Don't Skip the Homemade Basil Pesto

The basil pesto is what makes this Blackstone steak sandwich a little different from the traditional steak sandwich.

Pesto adds fresh basil, garlic, Parmesan, and olive oil flavors that cut through the richness of the ribeye. Instead of adding a heavy sauce or a lot of cheese, you get this bright, herby layer of flavor.

Spread it directly onto the toasted bread so you get a little pesto in every bite.

What Cheese Goes With a Ribeye Steak Sandwich?

I love this sandwich exactly as it is, but you can definitely add cheese.

Provolone would be my first choice because it melts beautifully without overpowering the steak and pesto. You could also try:

• Mozzarella
• White cheddar
• Pepper jack
• Swiss
• Smoked provolone

If you're adding cheese, place it over the sliced steak on the Blackstone for the last minute or so of cooking and let it melt before transferring everything to your sandwich.

Blackstone Steak Sandwich Variations

Once you have the basic recipe down, there are plenty of ways to change it up.

Mushroom Steak Sandwich: Sauté sliced mushrooms alongside the onions.

Pepper and Onion Steak Sandwich: Add sliced bell peppers to the griddle.

Cheesy Steak Sandwich: Melt provolone over the sliced ribeye before assembling.

Spicy Steak Sandwich: Add sliced jalapeños or a drizzle of hot sauce.

Garlic Bread Steak Sandwich: Brush the bread with garlic butter before toasting it on the Blackstone.

What to Serve With Blackstone Steak Sandwiches

Since these sandwiches are hearty, you don't need much to turn them into a complete meal. Serve them with French fries, sweet potato fries, potato wedges, onion rings, chips, pasta salad, coleslaw, grilled vegetables, or a simple green salad.

If the Blackstone is already fired up, grilled corn on the cob or crispy griddle potatoes would be especially good alongside these sandwiches.

Tips for the Best Blackstone Ribeye Steak Sandwich

Use a hot griddle for the steak. You want enough heat to create a good sear on the outside.

Don't constantly move the steak. Give it time to develop that flavorful crust before flipping.

Let the steak rest. Cutting into a ribeye immediately after cooking allows more of the juices to escape.

Slice against the grain. This helps make every bite more tender.

Toast your bread. The slight crunch is delicious and keeps the bread from becoming soggy.

Don't be shy with the pesto. That fresh basil flavor is one of the best parts of this sandwich.

Can I Use Leftover Steak?

Absolutely! This is actually a fantastic way to use leftover ribeye.

Slice the cold steak thinly and place it on the Blackstone just long enough to warm it through. Since the steak is already cooked, avoid leaving it on the griddle too long or it can become dry.

Grill your onions, toast the bread, add your pesto and steak sauce, and dinner is ready in minutes.

How to Store Leftovers

If you have leftovers, I recommend storing the individual components separately.

Keep the cooked steak and grilled onions in airtight containers in the refrigerator. When you're ready for another sandwich, warm them on the Blackstone or in a skillet and assemble the sandwich with fresh pesto and toasted bread.

This keeps the bread from getting soggy and gives you a sandwich that tastes almost as good as the first one.

The Perfect Blackstone Dinner

There's just something about a big, hearty steak sandwich cooked outside on the griddle. This Blackstone Griddle Steak Sandwich has everything I want in an easy dinner — juicy ribeye, sweet grilled onions, fresh homemade basil pesto, toasted bread, and just enough steak sauce to finish it off.

It's simple enough for a weeknight Blackstone dinner but delicious enough to serve when friends and family come over.

And if you've already got homemade basil pesto waiting in the fridge, these sandwiches are even easier to throw together!

Sandwich Recipes

• Chicken Fajita Sloppy Joes from A Kitchen Hoor's Adventures
• Chicken Walnut Pesto Sandwich from Creative Cynchronicity
• Shrimp Roll from Art of Natural Living
• Waldorf Chicken Salad Sandwich from That Recipe

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