A yellow, sugary, and sour lemon
flavoured hard candy
. American ones are very very sweet, while British ones are delightfully sour
and sometimes dusted in powdered sugar to cut the intense sour-ness and keep them from sticking to the wrapper.
Also, a shooter consisting of a shot of lemon vodka served with a slice of lemon dipped in white sugar. Gulp the vodka, then immediately stick the sugar coated lemon in your mouth. Mmm.