Before burritos the size of dachshunds became the rage, before tortillas started wrapping everything in sight, Rosa Linda's Mexican Cafe was selling great shredded-beef burritos from the window of its tiny storefront. Well, the more things change, the more they stay the same: Over the past eighteen years, Rosa Linda's has expanded, absorbing more space along the block, adding tables and menu items even as the Aguirre family, which owns the operation, added family members. But the shredded-beef burrito remains a constant: a soft flour tortilla stuffed with succulent shredded beef, then smothered in a verde redolent with onions, tomatoes and chunks of chile.