In a medium bowl, combine ricotta cheese, Prunes, parmesan cheese, garlic, and pepper. Set aside.
For each ravioli, brush edges of 1 wonton wrapper with egg white. Place 2 teaspoons prune mixture onto center. Fold diagonally in half to form a triangle; seal edges, pressing to remove any air pockets. Repeat with remaining filling and wrappers. Refrigerate on wax paper-lined baking sheet up to 2 hours or until ready to cook.
Meanwhile, in a small saucepan, cook butter and sage over medium-high heat until butter begins to brown. Remove from heat and keep warm. In a large saucepan, add half of the ravioli to boiling water. Cook 3 to 4 minutes or until tender. Using a slotted spoon, place ravioli in individual serving bowls. Repeat with remaining ravioli. Drizzle each serving with sage butter. Enjoy!