If you’ve been on social media of late, you know that doughnuts are having a spotlight moment. Come July, however, one’s attention is best rewarded by a sweet treat of another stripe: a Jersey-grown doughnut peach. These luscious fruits hit farm stands once a year, in high summer. Though grown in the US since the early ’90s, they remain rare. Less than 1 percent of the state’s 66-million-pound annual peach crop are doughnuts, according to the New Jersey Peach Promotional Council.