Put strawberries in a bowl; zest and juice lemon over the top and stir to combine. Cover and let stand at cool room temperature or chilled, stirring occasionally, for 24 hours.

Pour aquavit over mixture; cover and let macerate at cool room temperature or chilled for 24 hours. Reserve bottle and cap (you will need 2 bottles).

Strain mixture into a bowl through sieve, pressing to extract liquid. Wrap strawberry pulp in cheesecloth and squeeze over bowl to extract as much liquid as possible; discard remaining pulp. Let mixture settle for a few minutes, then strain through a fine-mesh sieve into a bowl (preferably with a pouring spout). Pour liqueur into bottles, seal and chill until ready to serve.

Note: Strawberry Liqueur keeps, chilled, for up to one year. The flavor becomes smoother over time.