It’s a testament to the warmth of Frank & Fina’s Cocina that when it closed its original, more central location on West Charleston Boulevard about three years ago to focus on its larger restaurant near the Beltway on Flamingo Road, regulars followed their favorite Mexican cuisine into the tony ’burbs. But it makes sense: Once you find your favorite taquitos and rellenos in a comfortable environment with kind, quick service, it’s hard to give it up. Aside from the overwhelming deliciousness — particularly the fresh, robust salsa served as soon as you take your seat — there’s something lighter and easier about eating at Frank & Fina’s