Step 1

Crust: Preheat oven to 375 degrees, with rack in center. In a food processor, pulse pretzels until fine crumbs form (you will have a little more than 1 cup). Add sugar and melted butter; process until combined. Press evenly in bottom and 1 inch up sides of a 9-inch springform pan. Bake until golden brown, about 9 minutes. Transfer to wire rack to cool completely.

Step 2

Filling: Reduce oven temperature to 325 degrees. Wrap exterior of springform pan with a double layer of foil. Set a kettle of water to a boil. In the bowl of an electric mixer fitted with the paddle attachment, beat cream cheese on medium-high speed until fluffy and smooth, about 3 minutes, scraping down sides of bowl as needed. Reduce speed to medium. Mix in sour cream, sugar, Grand Marnier, tequila, lime zest, and salt; beat until well incorporated. Add eggs, one at a time, beating well after each.

Step 3

Pour cream-cheese mixture over cooled crust (filling will come up higher than crust). Set springform pan in a roasting pan; carefully pour in enough boiling water to reach halfway up side of springform pan.

Step 4

Bake on center rack until cake is set and slightly firm to the touch, about 65 minutes. Transfer springform pan to a wire rack and remove foil; let cool completely. Refrigerate until chilled, at least 6 hours or up to overnight. Run a knife around edge of cake to loosen before unmolding. Garnish top of cheesecake with lime slices.