The best way to celebrate Halloween is with some unnaturally dyed food.

This year, Halloween will coincide with a lunar event known as a blue moon (a second full moon in the same month). To celebrate this spooky coincidence, Denny’s has unveiled a special meal that will scare the blue out of diners.

On Oct. 31, Denny’s will serve a special blue-hued version of its popular Moons Over My Hammy sandwich, which will be made with blue sourdough bread sandwiching more recognizable ingredients.

In a Twitter post, Denny's elaborates: “Blue ham? No. Blue eggs? Nah. Blue cheese? Boring. Blue bread for a Blue Moon? Now we’re talking.”

RESTAURANT THIEF FOUND SLEEPING IN BATHROOM WITH BOOZE, HALF-EATEN CHEESECAKE

But don't expect to stroll into just any Denny's and order a Blue Moons Over My Hammy. The sandwich will be available at select restaurants in Miami-Dade county, and only on Halloween.

“Only in 2020 would a Blue Moon coincide with Halloween — so what better way to celebrate than by giving one of our most legendary breakfasts, the Moons Over My Hammy, a little makeover?” said John Dillon, chief brand officer for Denny's. “With Halloween looking very different this year, we took the opportunity to make our world-famous sandwich look different as well, and this colorful upgrade gave us an opportunity to have some fun and show our guests that anything is possible in 2020!”

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An actual blue moon, meanwhile, is a term used for the second full moon in a single month. Blue moons also typically only occur once every two or three years, hence the term “once in a blue moon.” That said, one can only assume that blue bread, too, is something that happens only “once in a blue moon.”