Artichoke and Fennel Ravioli with Tomato-Fennel Sauce

Heat olive oil in heavy medium skillet over medium heat. Add chopped garlic and fennel seeds and sauté 3 minutes. Add artichoke hearts and chopped fennel and stir 1 minute. Add vegetable broth and bring mixture to boil. Cover skillet and cook until vegetables are very tender, about 12 minutes. Uncover and simmer until pan juices have evaporated completely, stirring occasionally, about 10 minutes. Scrape filling into processor and cool. Add fennel fronds and process to coarse puree. Season to taste with salt and pepper. Add yolk and blend. Line baking sheet with plastic wrap. If using wonton wrappers, trim edges to form rounds. Brush entire surface of 1 wrapper lightly with egg white. Place 1 rounded teaspoon filling in center. Fold dough over, forming semi-circle. Seal edges, pressing out any air around filling. Place on prepared sheet. Repeat with remaining filling and wrappers. (Ravioli can be prepared ahead. Cover loosely with towel and plastic wrap and refrigerate up to 8 hours, or cover with plastic and freeze 3 days. Do not thaw frozen ravioli before cooking.)