Step 1

Bring a pot of lightly salted water to a boil over high heat. Cook the orzo in the boiling water uncovered, stirring occasionally, until tender yet firm to the bite, about 8 minutes. Drain.

Step 2

Heat 2 tablespoons olive oil in a large skillet over medium high heat; cook and stir the onion and garlic in the hot oil until fragrant, about 1 minute. Crumble the ground lamb into the mixture; season with the oregano, basil, and salt and pepper. Continue cooking until the lamb is completely browned, 7 to 10 minutes. Remove from heat. Stir the orzo, spinach, tomatoes, tomato paste, and feta cheese into the lamb mixture until evenly incorporated.

Step 3

Preheat oven to 400 degrees F (200 degrees C).

Step 4

Evenly rub the outside of the bell peppers and the tops with 2 tablespoons olive oil. Season with salt and pepper. Arrange in a baking dish large enough to accommodate all of them standing upright. Fill the peppers with the lamb mixture and replace the tops.

Step 5

Bake in the preheated oven until the peppers begin to brown, 30 to 40 minutes.