Fish Tacos with Cabbage Slaw and Avocado Crema

INGREDIENTS

• 1 ripe avocado
• 1 cup
• or plain low-fat or nonfat yogurt
• 2 tsp. plus 2 Tbs. fresh lime juice
• 1 1/4 tsp. ground cumin
• 1/2 tsp. salt, plus more, to taste
• 2 cups shredded savoy cabbage or green leaf lettuce
• 1/2 cup diced English cucumber
• 1/2 cup diced red bell pepper
• 1 1/2 Tbs. extra-virgin olive oil
• 1 serrano chili, seeded and minced
• 3 Tbs. chopped fresh cilantro
• 2 Tbs. minced onion
• 1 lb. halibut or other firm-fleshed white fish fillet, skin removed
• Freshly ground pepper, to taste
• 8 corn tortillas