INGREDIENTS
1/4 cup
low-fat sour cream
3 1/2 tbsp
fresh lime juice, divided
3/4 cup
fresh corn kernels or frozen corn kernels, thawed
2
small plum tomatoes, seeded and diced
1/4 cup
thinly sliced green onions (about 3)
2 1/2 tbsp
olive oil, divided
2 tbsp
chopped fresh cilantro
1 tsp
minced seeded jalapeño pepper
3/4 tsp
salt, divided
1/4 tsp
freshly ground black pepper, divided
1 1/2 cups
thinly sliced onion
1/2
red bell pepper, seeded and cut into thin strips
8
(6-inch) tostada shells
1 lb
grouper or other firm white fish fillets
1/2 tsp
chili powder
1/4 tsp
ground cumin
Cooking spray
2 cups
shredded romaine or leaf lettuce