Beer Marinated Flank Steak Fajitas

• 2 pound flank steak, about 1-inch thick
• 1 red bell pepper, sliced
• 1 orange bell pepper, sliced
• 1 yellow bell pepper, sliced
• 1 sweet onion, sliced
• 1 red onion, sliced
• 8 ounces of your favorite beer
• 1/3 cup olive oil
• 1/3 cup fresh lime juice
• 2 tablespoons brown sugar
• 1 tablespoon Worcestershire sauce 
• 1 tablespoon cumin
• 1/2 tablespoon chili powder
• 2 teaspoons smoked paprika
• 1 teaspoon chipotle chili powder
• 1 teaspoon salt
• 1 teaspoon black pepper
• 4 garlic cloves, minced

for serving:

• Queso Fresco cheese
• fresh cilantro
• fresh salsa
• Sliced avocado
• corn tortillas or spring greens or tortilla chips!