Moisten rim of 1 cocktail glass with lime wedge. If desired, sprinkle salt on a plate; dip rim in salt. Fill glass with ice.
In an empty cocktail shaker, combine tequila, Triple Sec, lime juice and amaretto. Fill with ice; cover and shake until frost forms on the outside of the shaker, 15-20 seconds. Strain into prepared glass. Garnish with lime wedge and, if desired, cherries.