1 package 10 oz frozen artichoke hearts
1/2 red onion, sliced VERY thin
6 cloves garlic, whole
Juice of lemon, divided
Fresh rosemary sprig, chopped

Add all ingredients to a lidded casserole, reserving half the lemon juice. Bake covered for about an hour. Uncover, add reserved lemon juice, and bake another 5 minutes.