Hard cook (not hard boil the eggs). This will ensure bright yellow, flavorful yolks. Follow these instructions for how to cook them using an InstantPot, or these for a sous-vide. Personally, I think the sous vide produces a better, more consistent egg if you have one. We love ours!
Cool eggs in an ice bath.
Roll eggs gently on the counter or tap all over with the back of a spoon to evenly crack shells.
Meanwhile, add black gel food coloring and a small amount of water to a gallon ziplock bag.
Add eggs and roll until all eggs are covered in coloring.
Leave the bag in the fridge for 4-6 hours, or overnight.
Rinse the eggs with water before touching, to avoid getting food coloring on your hands.
Pour a small amount of white vinegar over the eggs to aide in peeling.
Peel to reveal a black marbled exterior. Rinse eggs thoroughly.