In a large pan, over medium heat, add oil. When the oil is hot, add the rice and saute for 30 seconds, add the onion and garlic and saute together with the rice for 1-2 minutes, then add 1 cup of hot water, salt and pepper and continue to cook, stirring from time to time.
When the rice is al dente, turn off the heat.
Add the fresh spinach, mix and cover the pan with a lid. Let the spinach soften in steam for about five minutes.
Remove the lid and add pesto and grated lemon peel. Stir well.
Heat the oven to 200C (390F).
Fill the pepper halves with the rice mixture, cover each pepper with a layer of cherry tomatoes, mozzarella and basil and place on an oven tray. Bake in the oven.
Cook for 20-30 minutes or until the cheese is lightly browned. Sprinkle the peppers with pine buds and fresh basil.