I have been trying to perfect the cosmo for years. Very rarely do I order one at a bar that is to my taste, either. Seems cosmos are either too bitter, too sweet, too sour, or too alcoholic tasting. Getting that perfect balance is difficult. Some people would argue that this recipe has too much cranberry. Again, after experimenting for years, this is the one for me. Perfect balance of sweet, bitter, tart, and alcohol. As far as lime, 1/8th lime is confusing. I use about 1/4 oz which is a good squeeze. Delicious. Be sure to use Ocean Spray Cranberry Cocktail and not pure cranberry juice which will be too tart. Cointreau works well, too, as opposed to Grand Marneir. Either is delicious. Personal taste on that aspect. Skip cheap triple sec.