Which came first, the brewer or the coffee? Clearly, coffee came first for Green Mountain Coffee Roasters Inc. (GMCR), Waterbury, Vt., which has been roasting specialty coffees since 1981. But when the company added its Keurig division in 2006, which supplies Keurig Single-Cup Brewing Systems, the business plan became: If you sell the brewer, single-cup sales will come. And they have.