2/3cupcucumber juice for the batter + 3/4 cup cucumber juice for infusing the cupcakes after they are out of the ovenI used about two cucumbers and got the juice by using a juicer. If you don't have a juicer, you can still make cucumber juice following the directions from Livestrong.
In a medium-sized mixing bowl or bowl of a stand mixer, mix together sugar, cake flour, baking powder, baking soda, and salt.
Add butter and mix on medium-low speed for three minutes. Because there is so little butter, you'll end up with a very fine crumb texture.
In a small mixing bowl, whisk together eggs, yogurt, oil, vanilla extract, gin, and vermouth until smooth.
Add the egg mixture to the flour mixture and beat on medium speed until just combined.
Slowly add cucumber juice and mix on low speed until just combined. The batter will be liquid. (Don't worry, you didn't do anything wrong. It's supposed to be that way.)
Fill cupcake liners just over 1/2 full.
Bake for 14 minutes and then test to see if they are done. They are done when a toothpick comes out without wet batter stuck to it. If they are not done, test again in two minutes. If they are still not done, test again in another two minutes.
While the cupcakes are still warm, use a toothpick to poke holes in them. Drizzle about two teaspoons of cucumber juice on top of each cupcake. The cucumber juice should get absorbed into the cupcake and enhance its cucumber taste.
Martini Cream Cheese Frosting Instructions
Mix cream cheese and butter until light and fluffy.
Mix in powdered sugar until fully combined.
Mix in gin and vermouth until just combined.
Spread onto cooled cupcakes. Note: This frosting will be too thin to pipe.
Notes
Candied Cucumber TopperThe candied cucumber topper makes these cucumber martini cupcakes extra special. Check out my post on candied cucumber for the recipe.