When husband and wife team Jeffrey and Cai Pandolfino launched Green & Tonic (www.greenandtonic.com) they thought they were getting into the healthy-food delivery business. But a market opportunity lead to a far bigger possibility: the chance to do for healthy food what Starbucks did for coffee. Here we break down how they are engineering a strategy to make that happen: who they target, how they build a unique product offering, and how they differentiate themselves from the competition.