Zest is the colored, flavorful top layer of the rind of any citrus fruit. When a recipe calls for zest, be careful not to use any of the white, fleshy pith layer below the zest; the pith is bitter and nasty.
Zest is the colored, flavorful top layer of the rind of any citrus fruit. When a recipe calls for zest, be careful not to use any of the white, fleshy pith layer below the zest; the pith is bitter and nasty.