How to Make It
Halve and squeeze 1 or 2 of the limes to yield 2 tablespoons of juice. In a large bowl, combine the lime juice and oil. Add the cabbage, onion, and cilantro, tossing to combine. Add salt to taste. Cut the remaining 2 limes into 6 wedges each. Set the slaw and lime wedges aside.
In a small bowl, combine the sour cream and chipotle pepper. Season with salt and set aside.
Arrange the tostadas on plates. Top with the pork, slaw, sour cream mixture, and tomatoes. Arrange the lime and radish wedges alongside and serve.