Preheat oven to 350 degrees. In a large bowl, combine bread crumbs, egg, half of the garlic, half of the rosemary, and 1/4 teaspoon black pepper. Add ground turkey: mix well. Shape meat mixture into 1 1/2 meatballs. Place meatballs in a foil-lined 15x10x1 inch baking pan. Bake about 15 minutes or until done in centers (160).Set aside.
In a 5-6 quart Dutch oven, heat oil over med heat. Ass carrots, sweet peppers, onion, ad remaining garlic: cook 5 minutes, stirring occasionally. Add beef stock , 2 cup water, Great northern beans, barley: reduce heat. cover and simmer about 15 minutes or until barley in tender.
Add meatballs to barley mixture: heat through. Stir in spinach just before serving.