Hot Roast Beef Party Sandwiches

2 9.25 oz packages of dinner rolls
2/3 c. peach preserves
1/2 c. finely chopped toasted walnuts
1/2 c. Dijonnaise (plain mayo with a little dijon mustard if you can't find)
3/4 lb. thinly sliced deli roast beef, chopped
1/2 lb. thinly slice havarti cheese

Remove rolls from package, but keep intact. With a serrated knife, cut rolls in half horizontally making 1 top and 1 bottom per package.  Spread peach preserves on cut side of top of the rolls.   Sprinkle with walnuts.
Spread dijonnaise on cut side of bottom of rolls.  Top with beef and cheese. Put rolls back together and place sandwiches back in foil pans.  Cover with foil and bake at 325 for 20-25 minutes until cheese is melted. Slice into individual sandwiches before serving.