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Anna Sacks outside Starbucks, 40th and Third Ave., showing all the food thrown out at that location.

Starbucks is throwing away a king’s feast of unsold food every night, even after the company promised it would stop doing so by 2020.

The Post scoured seven Manhattan store locations on a recent weeknight and found trash bags full of unsold food — much of it pristinely preserved in original packaging.

“It really varies by location,” Anna Sacks 28, a former investment banker who now works at a waste reduction consultancy told The Post during the night of dumpster diving. “A lot of times there are boxes full of bagels and pastries and egg sandwiches and those snack packages that are wrapped in packages with eggs and peanut butter and apples.

“It’s very easy for companies to make public sustainability goals for which they receive positive press and which they highlight in their [corporate social responsibility] reports, but then not follow through with them,” Sacks said.

Rescuing unsold food from the trash is a problem bedeviling many national retailers, but the issue was one in which Starbucks promised to lead. In 2016 the company announced their “FoodShare” program to much fanfare, revealing plans to donate their unsold food from 100% of US stores.

“When we thought about our vast store footprint across the US and the impact we could make, it put a fire under us to figure out how to donate this food instead of throwing it away,” Jane Maly, a Starbucks brand manager said in a press release at the time.

But since trumpeting their goals in 2016, the company seems to have slipped in achieving their self-imposed deadlines. The original target “to rescue 100 percent of the unsold food available from all 8,000 of its US company-owned stores” was 2021. But a press release in 2018 said the goal would be reached “by 2020.”

Only about 60% of stores currently participate in the program, reps for Starbucks confirmed, suggesting they will be unable to reach their FoodShare program goal by 2021.

Most of the food Starbucks tossed last week was just hours away from reaching its “sell by” date.

“There is a lot of confusion about food labels, and many people misinterpret ‘sell by’ and ‘use by’ labels as dates when food is no longer safe to consume. Actually, manufacturers make these labels based on estimates of when food will taste freshest. The food is usually still perfectly good to consume after the sell by date,” Racine Lee Droz, director of food sourcing at City Harvest, told The Post.

Matt Jozwiak, founder of the the food rescue non-profit Rethink Food NYC, said he would happily accept any unsold food Starbucks was trashing.

“If the sell by date is the 9th, we can pick it up on the 8th,” said Jozwiak.

Jozwiak, 32, takes between 500 and 2,000 pounds of unsold food every night to his kitchens in the Brooklyn Navy Yard, where they are prepared into meals and delivered to 10 soup kitchens around the borough. Food picked up Thursday evening can be repurposed into new meals by 2 pm Friday. He serves roughly 2,000 people a day.

“If there were hard-boiled eggs which I know [Starbucks] sell, we could make egg salad. If they have apples, we could make apple sauce. If there was a sandwich we got on the 8th and the sell by day was the 9th, we would take it,” he said.

There is also no fear of lawsuits thanks to the Bill Emerson Good Samaritan Act, a 1996 federal law which protects companies from liability from food rescue mishaps when donations are made in good faith.

Starbucks partners with the non-profit Feeding America.

Roughly 14.3 million Americans were classified as “food insecure” in 2018, while at the same time, Americans waste up to 40% of the nation’s total food supply according to the US Department of Agriculture.

“We’re working hard to scale this program to rescue 100 percent of available to donate food from our more than 8,000 stores by the end of 2020 and we’re proud to have donated more than 20 million nourishing, ready-to-eat meals to people struggling with hunger,” reps for Starbucks told The Post.