- Melt butter with olive oil in a large straight-sided sauté pan over medium high heat. Add onion and cook, stirring, until translucent.
- Add garlic and cook, stirring, until golden. Add a pinch of salt and some freshly ground black pepper, and cook 1 more minute.
- Add asparagus and season mixture liberally with kosher salt and freshly ground black pepper. Sauté until asparagus is lightly browned around edges.
- Check for taste and adjust seasoning if desired. Serve warm.