Fish in Foil with variations

2 firm fish fillets or steaks (5-6 oz. each) or 1 larger fillet (10-12 oz.), cut in half (ahi or salmon) 1 c. cooked rice 2 c. chopped mustard greens or bok choy or kale or a combination of these or other sturdy greens 2 scallions, chopped 1 T. vegetable oil (olive, peanut, or avocado) […]