I checked that one and I see missydarlin used to like Green Apple Martinis. I always liked the idea of them, but the reality was disappointing. I like missydarlin's suggestion of fresh apple puree. Here is another take on that, from a bartender in Eugene, OR:

Bad Apple

1 quarter green apple, seeded
2 oz Absolut Citron
1.5 oz lemon juice
1 oz simple syrup

Either muddle apple in a mixing glass or blend ingredients, without ice, until apple is pureéd smooth. Shake this mixture with ice and fine-strain into a chilled cocktail glass. Garnish with a slice of green apple.

Photo here.