Chill unopened can of milk in refrigerator until icy cold, about 3 to 4 hours. Dissolve gelatin in hot water. Chill until partially set. Whip until light and fluffy. Add lemon juice and sugar. Whip chilled milk and fold into gelatin mixture. Line bottom of 9 x 13-inch pan with crumbs. Pour over gelatin mixture. Top with remaining crumbs. Chill until firm. Cut in squares and center each with a maraschino cherry. Serves 12.
NOTE: If an Orange Fluff is desired, use orange flavored gelatin and 1/4 cup concentrated orange juice.
