1 Pour Tangerine Juice Through A Fine Mesh Sieve Into A Large Bowl. Use A Rubber Spatula To Press As Much Juice As You Can Through The Sieve, Discard Remaining Pulp. 2 Add Lemon Juice, Sugar, And (Optional) Corn Syrup To The Bowl. Stir With A Spoon Until The Sugar Has Completely Dissolved. 3 Process In An Ice Cream Maker According To Manufacturer'S Instructions. Serve Immediately, Or Chill For A Few Hours. Best Eaten The Day It'S Made. Makes A Little Less Than One Quart.