In a large pot, heat up olive oil and sauté onions, scallions, and garlic until translucent, about 3 minutes. Stir in the herbs for 30 seconds. Add tomato paste and chili pepper flakes, tossing to coat.
Add cabbage to the pot, season with salt and pepper, and pour in the broth. Mix well. Bring to a boil, then reduce heat to a simmer, cover, and cook for 10 minutes, or until cabbage is almost tender.
Stir in the rinsed rice and water. Bring to a boil, then reduce heat to a simmer, cover, and cook for about 15 minutes, or until rice is done, stirring occasionally.
Remove from heat and stir in the crumbled feta cheese. Taste and adjust seasonings if needed.
Notes
This Greek cabbage rice is a versatile side dish that pairs well with many main courses. For a heartier meal, you can add cooked chicken or ground meat.