In A Large Bowl, Combine Popcorn And Nuts; Set Aside. In A Large Saucepan, Bring Sugar, Butter And Corn Syrup To A Boil. Boil For 5 Minutes, Stirring Occasionally. Remove From The Heat; Add Vanilla, Cream Of Tartar And Baking Soda. Drizzle Over Popcorn Mixture; Stir To Coat. Immediately Spread Onto Two Greased Baking Sheets; Let Dry For About 1 Hour. Store In An Airtight Container.