Meet New York City’s pickiest panhandler.

Ron Clarke, 51, regularly positions himself in front of Union Market, the snooty Park Slope grocery spot that a local realtor nicknamed “Millionaire Market.” The discerning Clarke, often seen holding a cup full of coins at the chain’s Seventh Avenue outpost, would not disagree.

Last Tuesday morning, shortly after blowing part of a previous day’s proceeds on a pair of lottery tickets (“I buy them once in a blue moon,” Clarke insisted), he told The Post, “By standing in front of Union Market, I get nice groceries.”

Clarke may rely on the kindness of strangers for sustenance, but he won’t take everything he is given — even if it’s high-quality fare from the ritzy store.

On a recent Sunday morning, a woman bought him an egg-salad sandwich. He sent her back inside to exchange it for tuna salad, and she complied without question.

“I do not eat the yellow of the egg; it does not agree with me,” Clarke said, sitting atop the blue milk crate that he keeps stashed in front of the building next door. “I like the white of the egg.”

His fussiness comes from a combination of personal taste and a desire to stay healthy.

“Number one, I watch my cholesterol,” he said. “I do not eat processed meat or white potatoes. I won’t take canned fruit.”

To anyone who offers those items, Clark added, “I say, ‘I’m sorry, but I will not accept it.’ They take it back and walk away. Even hungry, I will not eat what I don’t like.”

And don’t you dare hand Clarke a culinary castoff: “If I am sitting and somebody comes by with [what’s left of] a smoothie and offers it to me, I will not take that drink and put it in my stomach,” he said. “Doctors [from nearby Methodist Hospital] applaud me for it. There could be something bad in there and I can wind up in the emergency room.”

But not everything is a dietary restriction. There is plenty that he will happily consume. “I like pork chops, turkey, seedless cucumbers, rice pilaf, whole-wheat bread, couscous and avocados,” Clarke ticked off, adding that his biggest food score came from somebody who entered Union Market specifically to load him up. “He brought me $50 worth of groceries, double bagged. There were crackers, kale, sardines.”

Born in Barbados, Clarke moved to New York about 20 years ago and went through a succession of jobs. He was laid off around two years ago from his last gig, doing home care for the elderly.

Unable to find another position — although he says he wants one — Clarke is currently “staying with friends.”

He said that his West Indian upbringing contributes to the way he eats. He’s also inspired by what he sees on “The Doctors” and divines from “The View” guest Dr. Ian Smith.

That said, he admitted to a few nutritional weaknesses: the occasional cinnamon raisin bagel and ginger ale. How often?

Clarke cheerfully replied, “Once in a blue moon.”