
Green apple is a tart, firm-fleshed apple variety, used for juice and muddled flesh.
Any tart apple does the same job, and Granny Smith is simply the most consistent. Bottled apple juice with a squeeze of lemon covers the sweetness and gives up the sharpness. Sour apple liqueur brings the flavor, sugar and a green color that reads as candy.
Red eating apples
Sweeter, softer and much lower in acid, so they juice into something closer to sugar water; in a drink built on tartness they leave a hole.
Apple juice from a carton
Filtered, pasteurized and stable, tasting of cooked apple, and useful when the apple is structural, wrong when the drink wanted the sharp fresh press.
Refrigerated whole for a couple of weeks and firmer than a soft eating apple the whole time. Once cut, brush with lemon and use within the hour. A bag of apples ripens everything near it, so keep them away from herbs and leaves.