I love celebrating the Kentucky Derby. I love celebrating Cinco de Mayo. This year they are on the same day, so I've combined 2 of my favorite drinks - the mint julep and the margarita and created a mash-up that I can sip while wearing a fancy hat and eating guacamole.
Place the limes in a cocktail shaker. Sprinkle with the sugar and add the mint leaves. Muddle well, making sure the juice is really extracted from the limes and the sugar dissolves. Add the bourbon and orange liqueur. Add a couple of ice cubes, cover and shake well. Strain. Can be served over ice or straight. Top with seltzer. Garnish with a lime wedge.