Rhubarb Corn Bread Stuffing

This is wonderful alongside chicken, turkey or ham!

5 cups chopped fresh or frozen
    rhubarb (1/2-inch pieces), thawed
1/2 cup granulated sugar
1 medium onion, chopped
1/2 cup butter or margarine, divided
3 cups cornbread stuffing
1/2 cup chopped walnuts

In a large bowl, toss rhubarb and sugar; set aside.

In a skillet over medium heat, saut