German Onion Tart - Stone Hill Winery

Ingredients

• 1 3/4 cups all-purpose flour, divided
• 1 1/2 tsp active dry yeast
• 2 tbsp butter or margarine just melted
• 1 egg lightly beaten
• 1/2 cup warm water
• 1 large mild, sweet onion (such as Vidalia), peeled, halved and thinly sliced
• 1 1/2 tsp butter or margarine
• 1 egg
• 1/2 cup sour cream
• dash of salt
• caraway seeds