First, pat the steak dry with paper towels, then drizzle with the olive oil and lemon juice. Add the minced garlic, then season generously with salt and pepper. Rub the seasonings into the steak using your hands. If you have time, season the steak the day before and let it marinate in the refrigerator.

Preheat an outdoor grill over high heat to 500F. Once the grill is hot, add the flank steak. Grill the beef for 3 to 4 minutes per side, until the inside is a medium. If your flank steak is on the thicker side, increase the grilling time by a few minutes. Allow the beef to rest before slicing it thinly into bite sized pieces

For the avocado salsa: toss together the diced avocado, diced tomato and shallot in a medium bowl, along with the cilantro, lime juice, olive oil and salt. Don't want to make your own salsa? Store-bought salsa will also work well! Try adding some diced avocado to store-bought salsa to give it more flavor!

I recommend warming your tortillas on the grill for this taco recipe! Just place them on the top rack of the grill as the steak is cooking, then remove and keep them warm. To enjoy these tacos, first place a generous amount of the sliced beef flank steak onto a tortilla, top with a few spoonfuls of the avocado tomato salsa and add a bit of crumbled blue cheese on top! Season the tacos with your favorite steak sauce or hot sauce to add more flavor!