In a 10 inch skillet cook the bacon for 5 minutes over medium heat. Once some fat has rendered add the tomatoes. Toss well and continue to cook a few minutes until the bacon is cooked to your liking. Gently fold in the avocado and lemon juice. Season to taste with salt and pepper.

Spread mayonnaise onto the tacos. Top with avocado mixture, some fresh greens and cheese. Serve immediately.