4. Oil the grill rack (see notes) or use a grilling basket. Grill the fish until it is cooked through and easily flakes with a fork, 3 to 5 minutes per side. Transfer the fish to a platter and separate into large chunks.

Serve the tacos family-style by passing the fish, tortillas, coleslaw and taco garnishes separately.

Recipe notes: Mahi-mahi (also called dorado) from the U.S. Atlantic and halibut from the Pacific are both sustainably fished and considered best choices for the environment. For more information, go to seafoodwatch.org.

Mildly spicy dried chiles, such as ancho or New Mexico, add moderate heat and rich flavor to Mexican sauces like mole. Chili powder made from these chiles has more flavor than American-style blends. Look for whole dried chiles in the produce section of large supermarkets and New Mexico or ancho chili powder in the specialty-spice section of large supermarkets or online at penzeys.com.

To oil a grill rack, oil a folded paper towel, hold it with tongs and rub it over the rack. (Do not use cooking spray on a hot grill.)

There are two ways to warm corn tortillas: 1. Microwave: Wrap stacks of up to 12 tortillas in barely damp paper towels; microwave on high for 30 to 45 seconds. Wrap tortillas in a clean towel to keep warm. 2. Oven: Wrap stacks of six tortillas in foil; place in a 375 F oven for 10 to 15 minutes. Wrap tortillas in a clean towel to keep warm.

Nutrition: Per serving: 318 calories; 9 g fat (2 g sat, 5 g mono); 110 mg cholesterol; 29 g carbohydrate; 1 g added sugars; 31 g protein; 5 g fiber; 714 mg sodium; 829 mg potassium.

Nutrition bonus: Vitamin C (30 percent daily value), Potassium (24 percent dv), Magnesium (22 percent dv), Vitamin A (17 percent dv), Iron (16 percent dv).

Carbohydrate servings: 2

Exchanges: 2 starch, 4 lean meat, 1 1/2 fat

(EatingWell is a magazine and website devoted to healthy eating as a way of life. Online at www.eatingwell.com.)