WEST HOLLYWOOD. Hungry shoppers who chance upon this Mexican food stand during their wanderings through the Farmer’s Market are delighted with its filling, authentic fare. Well-stuffed burritos, packed with beef, chicken, and pork, are just the beginning ­ albondigas (meatballs) in chipotle, tacos topped with zucchini and succotash, and even fresh cactus are a sampling of the appetizing fare available. Lime-aid, watermelon juice, and even hibiscus flower tea help wash it all down.