COMBINE graham cracker crumbs, sugar and butter in small bowl; press onto bottom of 9-inch springform pan.
BEAT cream cheese until fluffy in large bowl. Gradually beat in sweetened condensed milk until smooth.
SPRINKLE gelatin over lemon juice in small saucepan; let stand 1 minute. Stir over low heat until gelatin dissolves. Add to cream cheese mixture with mincemeat, walnuts and lemon peel; mix well. Fold in whipped cream; pour into prepared pan.
CHILL 4 hours or until set. Garnish with sour cream and additional walnuts, if desired.
I had this the first time many decades ago and fell in love but was warned never to tell anyone that it was mincemeat. Still my favorite kind of cheesecake and always gets rave reviews!