This recipe is from a Bon Appetit cookbook called Frozen Treats. It does not sound like a treat to me. I don't know what Grandma was thinking when she decided to put bread crumbs in ice cream but I think it was a bad idea.
Grandma's Pumpernickel Ice Cream
4 thin slices pumpernickel bread
2 tablespoons grated semisweet chocolate
1 teaspoon grated lemon peel
1/2 gallon vanilla ice cream, slightly softened
1 tablespoon sugar
1 tablespoon margarine
Finely chop bread in processor. Set aside 2 tablespoons crumbs. Mix remaining crumbs, chocolate and lemon peel in small bowl. Stir into ice cream. Return to freezer. Combine reserved breadcrumbs, sugar and margarine in small skillet and stir over medium-low heat until mixture begins to caramelize. Cool slightly. Spoon ice cream into bowls. Sprinkle with crumb mixture and serve.