1. With food processor on, drop Brussels sprouts through the food chute of food processor fitted with the slicer attachment. Transfer Brussels sprouts to a bowl.
2. Heat a large nonstick skillet over medium-high heat. Add bacon to pan; cook 5 minutes or until crisp, turning occasionally. Remove bacon from pan, reserving 2 tablespoons drippings in pan; set bacon aside. Reduce heat to medium-low; add vinegar and next 4 ingredients (through pepper), stirring well to combine. Add Brussels sprouts; cook 1 minute, stirring to coat. Cover and cook 2 minutes. Combine Brussels sprouts mixture and lettuce in a large bowl; toss until well combined. Sprinkle evenly with bacon and pecans. Serve immediately.