To make Mojo Wasabi Mayo, whisk together mayonnaise, lime juice, wasabi sauce and cumin.
In a large sealable plastic bag, combine soy sauce, orange juice, garlic and oregano. Place pork in bag, squeeze out air and seal. Refrigerate at least 2 hours or overnight. Remove pork from marinade and pat dry; grill or roast to an internal temperature of at least 145°F. Carve into thin slices and layer on sandwich buns with prosciutto, cheese, pickles and Mojo Wasabi Mayo.