Spring Lamb Stroganoff

Name: Spring Lamb Stroganoff
Ingredients: 1 lb lamb stew meat, diced; 4 tablespoons all-purpose flour; salt and pepper, to taste; 2 teaspoons marjoram, dried; 2 teaspoons garlic powder; 6 tablespoons grapeseed oil; 2 vidalia onions, medium-large (thinly sliced into strips); 1⁄2 lb morel, diced; 1 red bell pepper, diced; 1 tablespoon unsalted butter; 1 tablespoon thyme, dried; 1 teaspoon kosher salt; 1 teaspoon ground black pepper; 1 cup half-and-half; 1 3⁄4 cups light sour cream; 2 1⁄4 cups penne pasta, whole grain; 2 large heirloom tomatoes, diced