Heat oven to 400 degrees F. Combine flour, sugar, baking powder, lemon zest and salt into large bowl; but in butter with pastry blender or fork until mixtures resembles coarse crumbs. Stir in whipping cream; mix until dough holds together. Stir in crasins and 3/4 cup white chocolate chips.
Turn dough onto lightly floured surface; knead 5 to 10 times or until dough is smooth. Divide dough into 4 equal pieces; shape each piece into 8 inch log. Cut each log into 4(2 inch) pieces; cut each piece in half diagonally to form small triangles
Place scones, at least 1 inch apart, onto ungreased baking sheet. Bake 9 to 11 minutes or until golden brown around the edges. Cool completely
Combine remaining 1/2 cup white chocolate chips and shortening in small microwave-safe bowl. Microwave on MEDIUM(50% power) for 30 seconds; stir. Continue microwaving and stirring every 30 seconds until chips are melted and smooth. Drizzle scones with melted white chocolate.