Heat a pan over medium heat and sauté the sliced onion for 10–15 minutes until deeply caramelized. Add a splash of water if needed.
Add garlic, sundried tomatoes, Italian herbs, and chili flakes. Stir for another minute.
Mix in the balsamic vinegar, tomato paste, and nutritional yeast. Cook for 2 minutes.
Pour in the butterbeans with their liquid and the veggie broth. Let simmer for 10 minutes until thickened.
Stir in fresh parsley, lemon zest, and lemon juice. Taste and adjust seasoning if needed.
Serve with toasted sourdough or toss with pasta for a rich, comforting meal