Bring a pot of salted water to a rolling boil, then add the lobster tails. Let them simmer uncovered for about 8 to 10 minutes, until the shells turn bright red and the meat is opaque. Once cooled slightly, use kitchen scissors to cut down the shell and pull the meat out gently, discarding any shell fragments.
Dice the cooked lobster meat into small pieces. In a saute pan, warm the olive oil and cook the diced shallot for about two minutes until soft. Stir in the lobster and parsley, cooking for another two minutes, then let the mixture cool before combining with the ricotta, Asiago, mascarpone, and lemon juice in a bowl.
Lay a wonton wrapper on a clean surface and spoon about a teaspoon of filling into the center. Top with a second wrapper, press out any air pockets, and use a cutter to seal and shape each ravioli. If you don't have a cutter, simply fold the wrapper into a triangle and press the edges closed with your fingers.
Arrange the assembled ravioli on a parchment-lined sheet pan and brush each one lightly with melted butter. Bake at 400°F for about 10 minutes, until the edges turn golden and slightly crisp. This baking step is what gives the ravioli their signature toasty flavor.
While the ravioli bake, add the lemon juice and limoncello to a small saucepan and bring to a gentle simmer. Whisk in the cold butter cubes a few at a time until fully melted and glossy, then stir in the heavy cream and remove from heat immediately so the sauce doesn't separate