Grease a 10 inch cast iron or other oven proof skillet with 1 teaspoon of oil. Arrange lemon slices in a single layer in the skillet.
Combine 1 tsp oil, 2 minced garlic cloves, lemon peel, 1/4 tsp salt and 1/8 tsp pepper; rub over chicken. Place over lemons.
In a large bowl, combine rosemary and the remaining oil, garlic, salt and pepper. Add potatoes and tomatoes; toss to coat. Arrange over chicken. Bake, uncovered, at 450 for 25-30 minutes or until chicken is no longer pink and potatoes are tender.