Dzotobichay is one of the older things still cooked in Yucatecan kitchens. Corn masa, chaya leaves, pumpkin seed and egg: four ingredients that were all here before the Spanish arrived, held together in a roll and steamed. The name carries the Maya word chay, which is chaya, the leaf that grows as a shrub in half the yards on this peninsula and asks for almost nothing in return.

Around Tulum and across Quintana Roo you are most likely to meet it at breakfast or at a late morning market stall, cut into thick rounds, the ring of hard boiled egg sitting in the middle of green flecked masa, the whole slice buried under chiltomate and a heavy dusting of ground pepita. It also turns up at wakes and novenas and on the tables set out at the end of October, because it travels well, feeds a crowd, and keeps for the walk.

The taste is quieter than people expect. Chaya is not bitter and not grassy; cooked, it goes soft and mild and slightly mineral, closer to chard than to spinach. The weight comes from the pumpkin seed, which is toasted and ground to a coarse meal and goes both inside the roll and over the top, giving a dry, nutty richness that the tomato sauce cuts through. Without the sauce the whole thing is a little austere. With it, the balance is right.

Two things get muddled. The first is the relationship with brazo de reina, which is the same idea built as one long roll and sliced; some cooks use the two names for the same dish, others reserve dzotobichay for the smaller individual parcels. Neither camp is wrong. The second matters more: chaya must be cooked before it is eaten. The raw leaf contains compounds that break down with boiling, so it goes into water for a few minutes before it goes anywhere near the masa. Nobody here eats it raw, and the step is not optional.

If you are cooking outside the peninsula, chaya is the hard part. Chard or mature spinach will give you a tamal that works and tastes good, though it will be a different dish and worth calling by a different name.