To keep things easy, purchase fresh shrimp already peeled and deveined ... Add the butter, cabbage, and carrots and cook over high heat until the cabbage is browned in spots, about 2 minutes.
Arrange tostones on plate and give ceviche one final stir before spooning it generously over tostones. Slice avocado and place on top of ceviche on each tostone to complete dish. Serve with Cilantro ...