Grilled-Fish Tacos

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Ingredients

1 medium red onion
1/2 cup cider vinegar
1/4 cup sugar
7 tablespoons fresh lime juice, divided
1/4 cup chopped cilantro
1 tablespoon olive oil
1 1/4 pound (1-inch-thick) skinless mahimahi fillet or tuna steak, cut into 12 pieces
2/3 cup mayonnaise
2/3 cup crema or sour cream
12 (6-inch) corn tortillas
6 to 8 radishes
1 to 2 (6- to 8-ounce) firm-ripe avocados
4 cups thinly sliced green cabbage (1/2 small head)