Method
Add tequila, triple sec, lime juice, and cherry syrup to a cocktail shaker.
Add ice and shake until chilled.
Strain into a tall glass with ice.
Top with chilled Dr Pepper and stir lightly.
Garnish with a lime wheel and cherry, then serve immediately.
Cherry Syrup
Add cherries, sugar, and water to a small saucepan.
Bring to a boil, then reduce heat and simmer for 10 minutes.
Lightly mash the cherries with the back of a spoon to release extra flavor.
Strain into a jar and let cool completely.
Store in the refrigerator for up to 2 weeks.