By Tjibbe Hoekstra Reuters March 7, 2012 (Reuters) - Starbucks Corp, the world's biggest coffee chain, is hoping to boost growth in Europe, the Middle East and Africa by opening so-called concept stores that tailor products and cafe interiors to local tastes, a senior manager told Reuters. Starbucks will open between five and 10 such stores in the region this year, Rich Nelsen, senior vice president for Starbucks' Europe, the Middle East and Africa (EMEA) business, said in an interview. Those cafes will test new products, such as fresh-baked pastries, as well as exclusive coffees from small-scale farms, "If these new products and the other concepts we test here work, we will expand these to other countries," he said. On Friday, Starbucks will open its first European concept store in Amsterdam, followed by one in Kuwait later this year. Concept stores test new Starbucks products and sales ideas while their design and interior are inspi...