Add lemon juice, tequila, simple syrup and 1 cup of ice per cocktail into a blender. Blend well.

If making a salt rim, spread coarse salt out on a plate. Dip your margarita glass in water, then in the salt.

Pour blended margaritas into the glass, garnishing with a dehydrated lemon slice (if desired).

If making a salt rim, spread coarse salt out on a plate. Dip your margarita glass in water, then in the salt. Add ice to a margarita glass.

Fill a cocktail shaker halfway with ice. Add the lemon juice, tequila, and simple syrup. Shake well, then pour into your glass.