Customers are sweet on West Covina’s donut diva, retiring after 37 years of running Rainbow

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Customers are sweet on West Covina’s donut diva, retiring after 37 years of running Rainbow

Sing Yam, 58, is feeling lemon tart-sugar happy-sad about saying goodbye. The beloved owner of Rainbow Donuts in West Covina announced her retirement this week, with her last day on Saturday, prompting a steady stream of Rainbow loyalists to drop by for one last sweet visit. Sing Yam, owner of Rainbow Donuts in West Covina, hugs Dave Herrig, 77, of Pomona. Yam is hanging up her apron after 37 years in business. Generations of customers are sayin…