How to make a foil packet: 
Lay a large sheet of heavy-duty foil or a double layer of regular foil on a flat surface.  Put the ingredients in the center of the foil. Bring the short ends of the foil together and fold twice to seal; fold in the sides to seal, leaving room for steam. Grill as directed. 

Succotash:

Toss lima beans, corn, diced red bell pepper, thyme, butter, salt and pepper on a sheet of foil. Form a packet. Grill over medium-high heat, 10 minutes. Open and stir in 1/4 cup cream. Reseal; grill 10 more minutes. Top with chopped parsley.