French Onion Smash Burger Taco

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@alexawhatsfordinner pairs some powerhouse flavors in these French onion-inspired smash burger tacos! Caramelized onions, beef, Gruyère, and more are joined together in glorious harmony ? Recipe below‼️

Ingredients
-2 Tbsp unsalted butter
-1 large yellow onion, sliced
-1 tsp kosher salt
-½ pound lean ground beef
-¼ cup store-bought onion dip mix
-1 tsp freshly ground black pepper
-1 tsp red pepper flakes
-4 taco-size flour tortillas
-Freshly grated Gruyère cheese
-Worcestershire sauce
-Large handful arugula
-Balsamic glaze

Preparation
-Melt the butter in a large pan over medium heat. Add the onion, season with salt, and cook, stirring frequently, for 30-40 minutes, until deep golden brown and caramelized.
-Meanwhile, in a medium bowl, combine the ground beef, onion dip mix, black pepper, and red pepper flakes. Gently mix together until just combined.
-Divide the beef mixture into 4 even balls. Use your palm to smash a beef ball onto each tortilla, spreading it over the whole tortilla and flattening it as much as possible.
-Heat a cast iron skillet over medium-high heat. Working one at a time, add a smash taco to the pan, meat-side down, and cook for about 5 minutes, until the beef is deeply browned and cooked through. Flip the taco and cook for about 3 minutes on the other side. Transfer to a plate and repeat with the remaining tacos.
-Top each taco with a handful of grated Gruyère, some caramelized onions, a few drops of Worcestershire sauce, a small handful of arugula, and a drizzle of balsamic glaze.
-Enjoy!