In a small bowl mash the flesh of one avocado with lemon juice, sea salt and cayenne pepper. Slice the second avocado thinly.

Spray a skillet with olive oil and cook bacon until brown. Remove from heat. Add onion slices to skillet and cook until brown, about 3 minutes per side. Remove from heat.

Assemble sandwiches by spreading mashed avocado on a slice of bread. Layer tomatoes, onions, bacon, sprouts and avocado slices. Top with remaining slice of bread and serve.