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1
Toast seeds. In a dry skillet over medium heat, toast unhulled and hulled pumpkin seeds separately, stirring constantly, until lightly browned and fragrant. Cool completely, then grind together to a coarse-fine powder. Set aside, reserving a portion for serving.
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2
Beat the masa. Combine masa, lard, and salt. Beat vigorously by hand or with a mixer until the lard is fully incorporated and the dough is cohesive. Divide into 8 equal balls.
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3
Prepare leaves. If using chaya: blanch with gloves on in boiling water 3–4 minutes; drain and pat dry. If using Swiss chard: wilt in boiling water 20–30 seconds; drain and pat dry. Leaves must be pliable and dry.
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4
Assemble. Working one at a time, press a masa ball into a thin, even round on a prepared leaf. Sprinkle generously with ground seeds. Lay 2–3 egg wedges across the center. Roll firmly jelly-roll style, then fold the leaf ends over to enclose completely.
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5
Steam. Arrange packages in a steamer basket seam-side down, not crowded. Steam over steadily boiling water for 1 hour, replenishing water at 30 minutes if needed.
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6
Serve. Unwrap at the table. Spoon tomato sauce over the top and pass extra ground seeds alongside.