1. Preheat oven to 350°. Butter a 1-quart ovenproof dish, and set aside. Heat oil in a large skillet over medium heat. Add onion, and sauté 3 to 4 minutes or until soft and translucent.
2. Combine onion, artichoke, and next 9 ingredients in a large bowl, add sea salt and pepper, and stir to combine thoroughly. Transfer to prepared dish, and bake at 350° for 30 to 35 minutes or until heated through and bubbling around edges. Serve warm with Belgian endive, crostini, or crackers.