Mix 1/4 cup lime juice and 1 tablespoon each fish sauce and olive oil; season with salt and sugar. Toss half of the dressing with shaved carrots, sliced red onion and cilantro. Lightly mix 6 ounces ground pork with a big pinch of kosher salt. Form into a ball, then shape into a 3/4-inch-thick patty; make an indentation in the center. Preheat a grill to high; brush the grates and burger with canola oil. Season the patty with salt and grill about 4 minutes per side, basting with the remaining dressing. Serve on a roll with mayonnaise, chili sauce and the slaw.