It was gold that first put Nevada City on the map, but in the 1980s it was the truffles. Before the huge chocolate boom of the 1990s, Rudy Udarbe and Willem DeGroot began selling truffles at their elegant shop on Broad Street. This year, they look forward to their 25th anniversary at the same location. Originally from Holland, Chef DeGroot came to the U.S. as a young man with his family. He spent thirteen years as a Capuchin monk in a Franciscan monastery. It was here that his secret recipes and the passion for chocolate and baking were born. These …