I love what the orange peel does to this drink - it is the perfect complement to a hearty breakfast or casual brunch. If you're serious about your cocktails, make sure all of the ingredients (even the glasses) are chilled when making this drink.
Put the orange slices into a durable bowl and add the lemon juice and the pinch of salt. Use a wooden spoon to "bruise" the orange slices so that the oil in the peels emerges and the pulp from the orange mixes with the lemon juice. Add the vodka and continue to stir. Add the orange juice and combine well.
Divide the ice among 8 glasses and pour in the drink mixture. Serve immediately.