Ruddy brown, smooth, and gleaming like polished river rocks, iron eggs don’t immediately stand out as a potential taste sensation. Hard cooked, then re-cooked, and re-cooked yet again, these Taiwanese specialties may have been created by accident, but they’ve clearly stuck around on purpose. Naturally, we have many options aside from eggs to apply this technique, which is how my Iron Tofu came about.

What Are Iron Eggs?
Iron eggs, or “tiědàn” (铁蛋), have a short but rich history dating back to Tamsui District in Taiwan. Legend says they were invented by a noodle stall owner in the 1970s, trying to keep their eggs hot and ready for customers who just weren’t buying. After hours of cooking, cooling, cooking, and cooling, what were originally basic red cooked eggs became dark, hard, and chewy. Today, they’re a beloved street food and a staple at night markets, especially given that this technique effectively preserves eggs without refrigeration.
What Do Iron Eggs Taste Like?
Despite the name, they’re not made of iron, nor are they particularly iron-rich. The metallic title comes from the repeated stewing process, where the eggs are simmered for hours in a dark, flavorful broth of soy sauce, spices, and black tea leaves. This imbues them with a deep brown color, a chewy texture that’s reminiscent of beef jerky, and a complex symphony of sweet, savory, and slightly spicy flavors.

Making Vegan Iron Eggs
Tofu, the Swiss army knife of plant protein, makes an incredibly convincing substitute for the conventionally mandated quail or chicken eggs in this instance. While they won’t have the distinctive divide between yolk and white, the cooking process effectively makes the two layers impossible to discern from one another in any case. Rather, super firm tofu already has half of the work done for you, without any pressing necessary, creating Iron Tofu in half the time it would take to make iron eggs.
Ironclad Good Eats
Iron tofu is ready to eat as a standalone snack, perfect for whenever you might otherwise reach for a protein bar or jerky. Otherwise, it’s an excellent addition tossed into salads, on top of rice bowls, or diced finely and mixed into soups, stews, or stir fries. Intensely flavorful, a little bit goes a long way in any dish. Personally, I’m perfectly content to munch on them out of hand, paired with a cold beer or sweet bubble tea for contrast, as the perfect afternoon pick-me-up or late-night nosh.















