Grease an ovenproof skillet with the butter. Add the grapes, and walnuts; sprinkle with the sugar. Roast about 25 minutes in a 500^ oven
Transfer mixture to a bowl using a slotted spoon.
Simmer the juices with the honey on the stove until syrupy about 6-7 minutes. Remove from the heat, add lemon juice and pepper. Pour over the grapes.