get some lemons (I would recommend organic since the skin is where most of the pesticides are and we need the skin)
zest them (that is take off the yellow part of the skin but leave the white pith)
pour some alcohol in a bottle or some sort of container you can keep sealed for a couple weeks
put zest in alcohol (ideally high proof stuff like everclear or 151)
after a couple weeks you will have a lemon tincture
Im not sure how much you will need or how much would be good amount of lemon flavor in a beer, sorry
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