Indian Cheese and Red Peppers in Fragrant Spinach Sauce

2 cups cooked spinach

1 sweet green pepper , cored and seeded

6-8 tablespoons light vegetable oil

1/3 cup all-purpose flour for dusting

1 1/2 cups finely chopped onion

2 tablespoons grated or crushed fresh ginger

1/2 teaspoon turmeric

4 hot green chilies, minced

1/2 cup water

1 teaspoon coarse salt , or to taste

2 medium-size sweet red pepper s, cored, seeded, and cut into 1-inch-wide strips

2 teaspoons garam masala (see tips, below)