Limeshot Mexi-Martini

1 (3 ounce) package lime-flavored gelatin mix (such as Jell-O®)

1 cup boiling water

1 cup tequila

coarse salt, as needed

1 cup ice cubes, or as needed

1 cup margarita mix

½ cup tequila

1 (12 fluid ounce) can or bottle beer

1 lime, sliced

Combine lime-flavored gelatin mix and boiling water in a bowl; stir until gelatin is dissolved. Stir 1 cup tequila into gelatin mixture. Pour into about 24 shot glasses and place in refrigerator to set, at least 1 hour.

Salt the rims of 4 to 6 martini glasses.

Combine ice, margarita mix, and 1/2 cup tequila in a cocktail shaker; shake until well mixed. Place a lime-flavored gelatin shot in the bottom of each prepared martini glass. Pour margarita mixture over the shot, leaving enough room to top with beer. Top each margarita-martini with beer. Garnish with a lime slice.