For the marinade: In a medium bowl, combine the garlic, oil, lime juice and zest, orange juice and zest, cilantro, Worcestershire, jalapeno, coriander, cumin, oregano and salt and pepper to taste.
For the fajitas: Place the steak in a large resealable plastic bag and pour half of the marinade over. Seal the bag, pressing out as much air as possible, then massage to distribute the marinade. Lay the bag flat and refrigerate for 4 hours, flipping it occasionally.
Place the mushrooms, onions and peppers in another resealable plastic bag and pour in the remaining marinade. Seal the bag, pressing out any excess air and massage to distribute the marinade. Refrigerate for 4 hours, flipping it occasionally.
Twenty minutes before cooking, bring the steak to room temperature. Wipe it clean from the marinade and pat it dry. Heat a grill pan or griddle over medium-high heat and spray generously with cooking spray. Cook the steak, 3 to 4 minutes on each side for medium doneness. Transfer to a cutting board, cover loosely with aluminum foil and allow the meat to rest for 10 minutes. Slice the steak across the grain into thin slices and place on a serving platter.
Meanwhile, drain the marinade from the vegetables. Heat 2 to 3 tablespoons of oil in a large skillet over medium-high heat until shimmering. Add the vegetables and let them cook undisturbed for 1 to 2 minutes. Stir and continue cooking, stirring occasionally, until they are softened and have some browned spots, 5 to 6 minutes. Remove to a serving bowl and keep warm until ready to use.
For serving: Serve the beef and vegetables along with all the accompaniments in separate dishes so that people can assemble their own fajitas.
In a large bowl, combine the pineapple, watermelon, cilantro, cucumber, mango, papaya, red pepper, lime juice, chili powder, jalapeno, onion and 1/2 teaspoon salt. Stir to mix together and let sit for at least 10 minutes so the flavors blend. Serve with tortilla chips or tacos.
In a bowl combine the avocados, red onion, jalapeno, cilantro, Cotija, lime juice, chili powder and 1 teaspoon salt. Mix well while mashing up the avocados slightly. Serve immediately with tortilla chips.
In a small slow cooker, add the cheese cubes as well as both cans of the tomatoes with chilies, including the liquid from the cans. Set the slow cooker to low and let melt, stirring occasionally, until completely melted, about 30 minutes. Keep warm until ready to serve.
Serve with tortilla chips, flour tortillas or as a topping for fajitas, nachos or tacos.