Asian Beef 'Spring Rolls'

Brown meat in large skillet; transfer to plate.

Heat 1 Tbsp. dressing in same skillet on medium-high heat. Add carrots; cook and stir 3 min. or until crisp-tender. Stir in remaining dressing, meat and peanut butter; cook 2 min. or until heated through, stirring occasionally.

Spoon onto lettuce; roll up.