Combine sugar, corn syrup, milk, and cream of tartar in 2-quart glass measure.
Cook on HI, 6 minutes.
Let stand 3 to 4 minutes, or until slightly cooled.
Beat vigorously until creamy.
Add peppermint extract and food coloring.
Drop by teaspoonfuls onto sheets of foil.
Let stand until cool and firm.
Store in airtight container.