The Worcestershire sauce and mustard boost the flavor of this dish considerably, so choose a delicate, well-balanced Riesling from either Alsace or the Pacific Northwest.
Combine the first 8 ingredients in a bowl; stir well. Shape mixture into 24 (1-inch) meatballs.
Coat a large nonstick skillet with cooking spray; place over medium heat until hot. Add meatballs; cook 10 minutes or until browned, stirring frequently. Remove from skillet; set aside.
Add garlic to skillet; sauté 30 seconds. Add wine; bring to a boil over medium heat, and cook 1 minute. Return the meatballs to skillet; cover and cook 5 minutes or until done. Remove from heat.
Remove meatballs from the skillet with a slotted spoon; set aside, and keep warm. Add sour cream (at room temperature) and pepper to wine mixture in skillet; stir well. Spoon sauce over meatballs.
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