<p class="ingestion featured-caption">I tried four of the most popular flavors at The Holy Donut in Portland, Maine, including a seasonal blueberry doughnut.Erin McDowell/Business Insider</p><ul class="summary-list"><li>I recently went behind the scenes at The Holy Donut, one of the most famous doughnut shops in Maine.</li><li>I tried four of their <a target="_blank" class href="https://www.businessinsider.com/tates-bake-shop-cookies-flavors-ranked-worst-to-best">most popular flavors</a>, including a savory and a seasonal blueberry doughnut.</li></ul><p>Nothing quite says late summer or early fall like a delicious hand-crafted <a target="_blank" class href="https://www.businessinsider.com/dunkin-doughnut-flavors-ranked-worst-to-best-review">doughnut</a> straight out of the fryer.</p><p>On a recent trip to Portland, Maine, from Connecticut, I stopped by <a target="_blank" class href="https://www.theholydonut.com/">The Holy Donut</a>, a famous doughnut shop that has been featured on television shows like "Man vs. Food" and gained a reputation for its unique potato-doughnut recipe.</p><p>The Holy Donut opened its doors in 2012 as a small business and has since grown into a Maine institution, with five locations across the state. I visited the <a target="_blank" class href="https://www.businessinsider.com/best-donut-shops-us-2018-9">doughnut shop</a>'s Park Avenue location in Portland, the first shop the family-run business opened.</p><p>I tried four of The Holy Donut's most popular flavors and saw firsthand why this small business has become one of Portland's best not-so-hidden gems.</p><p>If you visit any of The Holy Donut's locations, you must try these doughnut flavors.</p>