In large bowl, cream shortening and butter with electric mixer until light and fluffy. Combine coffee granules, milk and vanilla; add to butter mixture and beat well. Gradually add sugar, one cup at a time, beating well on medium speed. Scrape sides and bottom of bowl often. Continue beat at high speed until light and fluffy, about 7 minutes.
Keep icing covered with a damp cloth until you are ready to decorate. For best results, keep icing bowl in refrigerator when not using. Rewhip before using.
Makes about 3 1/2 cups icing.