Trim and discard the stems of the greens and wash and dry the leaves. Stack the leaves, roll into cylinders and cut across the rolls into 1-inch strips. Melt 1 tablespoon of the butter in a large skillet over medium-high heat until bubbly. Saute one quarter of the greens with 1/8 teaspoon of the salt and a pinch of the pepper until the greens are limp, 30 seconds to 1 minute. If the greens begin to brown before they wilt, sprinkle in a few drops of water for steam. Transfer to a covered platter and repeat the procedure with the remaining 3 batches of greens. Serve immediately.