Negroni Bars

2 cups finely crushed pretzels
1/3 cup dark brown sugar
1/4 cup dry milk powder
12 tablespoons salted butter, melted
Negroni Filling:
3 cups white sugar
6 large eggs, at room temperature
1 cup all-purpose flour
1 grapefruit, zested
1/2 cup orange juice
1/4 cup grapefruit juice
1/4 cup bitter orange aperitif (such as Campari®)
2 tablespoons gin
2 tablespoons red vermouth
1 cup freeze-dried strawberries

Preheat the oven to 325.
Grease and line a 9x13-inch baking pan.
Combine crushed pretzels, brown sugar, and milk powder in a medium mixing bowl.
Add butter to the bowl and toss to combine.
Press the pretzel mixture into the bottom of the prepared pan.
Bake in the preheated oven until lightly browned, 12 to 15 minutes.
Transfer to a wire rack to cool.
Increase oven temperature to 350.
Whisk sugar, eggs, flour, and grapefruit zest together in a large bowl.
Whisk in orange juice, grapefruit juice, orange aperitif, gin, and vermouth.
Pour over the pretzel crust.
Bake in the preheated oven until filling is set, 30 to 35 minutes.
Cover with foil if filling starts browning too quickly.
Cool completely on a wire rack, 20 to 30 minutes.
Refrigerate until firm, about 1 hour.
Pulse freeze-dried strawberries in a food processor until finely ground.
Use a fine-mesh strainer to dust strawberry powder over the filling.
Cut into 24 bars and serve.