A woman failed a breath test after pulling over in Westgate to get a Chinese takeaway.
Tracy Ward of Walcott Road, Billinghay, had been to the bowling alley in Dysart Road before getting behind the wheel and driving to Westgate.
Police attended following a tip-off from a member of the public.
Ward failed a roadside breath test and a follow-up test at Grantham police station where she blew 63 microgrammes in 100ml of breath.
Rob Arthur, defending, told the court Ward drank two pints of Stella before getting behind the wheel.
Ward, 30, admitted drink-driving and was banned from driving for 18 months.
She must also pay a fine of £110, £85 in costs and a surcharge of £20.