Bake pastry shells according to package directions. Meanwhile, in a Dutch oven, bring the water to boil. Add carrots and 1/2 teaspoon salt. Reduce heat to medium; cook for 8-10 minutes or until tender. Add peas; cook for 1 minute. Drain and set aside.
In a large skillet, saute leek and garlic in butter until leek is crisp-tender. Add the tomato puree, tomatoes, sugar, oregano, pepper and remaining salt. Bring to a boil. Reduce heat. Add the lima beans and carrot mixture; cook for 5 minutes or until vegetables are heated through. Remove tops from pastry shells; fill with vegetable mixture.