I've tried many red apple martinis and found out that simple is best!
1 shot of vodka
1 shot of sour apple pucker liquor; I used Dekuyper
1 1/2 shots of 100% pure cranberry juice
sliced apple for garnish
Fill a cocktail shaker 1/4 of the way with crushed ice.
Add all the above ingredients.
Strain into a martini glass and garnish with a slice of red apple.