Preheat oven to 375° F/190°C Combine 4 Tbsp. (60 mL) Becel® Buttery Taste margarine, Knorr® Chicken Bouillon Cubes and lemon juice in small microwave-safe bowl. Cover and microwave at HIGH 60 seconds; stir. Cool slightly.
Place chicken in large roasting pan and place squeezed lemon rind into cavity. Evenly spoon Bouillon mixture over chicken. Toss potatoes, shallots and remaining 2 Tbsp. (30 mL) margarine in large bowl. Arrange around chicken in roasting pan.
Roast 1 hour. Baste chicken with pan juices and stir vegetables; continue roasting, basting chicken and stirring vegetables occasionally, until vegetables are tender and instant read thermometer inserted in thickest part of chicken thigh reaches 165° (75 C), about 45 minutes.
Remove vegetables and chicken to serving platter; serve.