The Easiest Way To Elevate Boiled Eggs With A Flavor Infusion - Tasting Table
Briefly

"I like experimenting with other liquids... to infuse eggs while boiling them. Different types of liquid will result in different flavor profiles..."
"Though eggshells seem hard compared to the insides, they're actually quite porous. That means the egg whites and yolk get a tinge of flavor."
Read at Tasting Table
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