In a spacious skillet, pour in the olive oil and warm it over medium-low heat, allowing it to become fragrant without smoking.
Gently add the thinly sliced onions to the skillet, seasoning them with a pinch of sea salt to enhance their sweetness. Cook them slowly, stirring occasionally, for about 15-20 minutes until they are soft and golden-brown.
Once the onions have achieved perfect caramelization, stir in the minced garlic and sauté for an additional 1-2 minutes until it becomes aromatic and golden.
Next, gently fold in the drained butter beans, ensuring they are well-mixed with the onion and garlic mixture.
Drizzle the balsamic vinegar over the beans and onion, then sprinkle in the dried thyme, along with a dash of salt and freshly cracked black pepper. Stir everything well and allow it to cook for an additional 5 minutes.
Remove the skillet from the heat and taste for seasoning, adjusting with more salt or pepper as desired.
Serve this warm dish in bowls, garnished generously with freshly chopped parsley.
Notes
Serve in shallow bowls or as a side dish alongside grilled meats, with extra olive oil and fresh thyme for presentation.