Popular in Jewish communities throughout the Mediterranean and Middle East, these beautifully marbled rich maroon or brown eggs get their soft texture from the slow cooking process. The addition of onion skins to the liquid are absorbed by the porous shells, which cause the coloration. Huevos Haminados are traditionally served at the Passover Seders of Calcutta, Turkey, Greece, Morocco and Tunisia and others, with slight regional variations. They can also be slowly cooked overnight in a crockpot for Shabbat. The name reflects the eggs' origin in Medieval Spain.