Athenians Stuffed Peppers

1 pound ground beef1 cup rice 2 onions, ground 1 clove garlic, minced1/2 cup vegetable oil 1 (6 ounce) can tomato paste, divided1 1/2 tablespoons salt, divided 3/4 teaspoon pepper, divided1/2 teaspoon oregano 1 egg, well beaten 8 green bell peppers6 cups water 5 medium potatoes, sliced Combine meat, rice, onions, garlic, oil, 1 tablespoon …