- Sauté the onion: In a skillet over medium heat, warm olive oil and sauté chopped onion for 3–5 minutes until soft and golden. 
- Add garlic: Stir in minced garlic and cook for 30 seconds, just until fragrant. 
- Build the broth: Pour in vegetable broth, brown sugar, soy sauce, salt, and pepper. Stir to combine. 
- Add green beans: Add canned (drained), frozen, or fresh green beans. Simmer on low for 10–15 minutes until tender. 
- Finish the flavor: Add red pepper flakes and a splash of vinegar or liquid smoke, if using. Adjust seasoning to taste. 
- Let it rest: Remove from heat and let sit for 5–10 minutes before serving to deepen the flavor.