Fill a blender with ice; blend until ice is crushed. Pour tequila, elderflower liqueur, and jalapeno pepper slices over ice. Add strawberries, limeade, and strawberry daiquiri concentrate; blend until smooth, about 30 seconds.
Fresh strawberries can be used in place of the sweetened frozen strawberries. Add 1 1/2 fluid ounces agave nectar to 8 ounces sliced fresh strawberries.