Trim cucumbers and slice on an angle into 1/4” ovals. Stem dill. Cut roasted red pepper into 1/4” dice. Halve croissants lengthwise. A serrated knife works best on delicate breads like these flaky croissants.

Whisk mascarpone and half the heavy cream in a mixing bowl until combined. Add additional heavy cream, 1 Tbsp. at a time, until mixture thickens to a spreadable consistency. You may not use all of the heavy cream. Add half the dill and mix to combine.

Gently spread mascarpone mixture onto bottom halves of croissants. Top with roasted red peppers and half the cucumbers. Tear each slice of salmon in half, roll into loose spirals, and arrange on croissants. Rolling salmon pieces gives them height, resulting in a better presentation. Cover with croissant tops.

Divide remaining cucumber, sugar, and remaining dill between two tall glasses. Roughly mix ingredients with the end of a wooden spoon until combined, about 1 minute. This is called "muddling." Divide pineapple juice between both glasses. Top off each glass with sparkling water. Add a splash of vodka, Champagne, or light rum, if desired.

Serve sandwich and mocktail to someone special in your life and make sure he or she has the rest of the day off.