At first glance, these Lychee-Frosted Sugar Cookies from my cookbook “108 Asian Cookies: Not-Too-Sweet Treats from a Third-Culture Kitchen” appear humble when unfrosted, like any other ordinary sugar cookie, like those you would find at the supermarket. But don’t be fooled. These charming sugar cookies shine even on their own with their rich buttery base, tender crumb, bright refreshing citrus notes and a slight chew.