Potato, Kale, And Kielbasa Casserole Recipe

• 3 lb russet (baking) potatoes (about 6)
• 1/2 stk unsalted butter (1/4 c.)
• 3/4 c. chicken broth
• 2 Tbsp. cider vinegar
• 2 1/2 lb kale coarse stems discarded and the leaves washed well
• 1/2 lb Munster grated coarse (about 2 c.)
• 1 lb smoked kielbasa cut crosswise into 1/4-inch-thick pcs
• 2 lrg onions halved lengthwise and sliced thing crosswise

Directions