Place crumbled cotija cheese in a bowl. Add mayonnaise, lime juice and lime zest. Mix well while still leaving the cotija cheese crumbled. Season to taste with salt and thin with a small amount of water if necessary.
Quickly grill or sauté the lobster with butter to warm through. Set aside.
To prepare Watermelon Radish Slaw, combine cilantro, minced jalapeno, lime juice, olive oil, dill, watermelon radish. Toss well to combine. Season with salt and pepper. Set aside.
Warm 3 corn tortillas. Spread with 1 tbsp. of Cotija Lime Mayonnaise. Top with a slice of avocado and 2 ounces of lobster per taco. Finish with the watermelon radish slaw.
