Orange Bourbon Sour

One of my favorite cocktails. Serve in an old fashioned/rocks glass, over plenty of ice. Garnish with an orange slice. The pitcher will serve 6 to 8 cocktails, depending upon how much ice is in the glass.
 
For one cocktail:
2 oz. bourbon (or Jack Daniels Tennessee Whiskey)
2 oz. orange juice
1 Tablespoon fresh lemon juice
 
For a small pitcher:
1½ cups bourbon
1½ cups orange juice
1/4 cup fresh lemon juice