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1
Bring the salted water to a full rolling boil (100°C / 212°F). Add the greens and cook until tender, 5–8 minutes depending on species and leaf thickness.
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2
Drain thoroughly. Once cool enough to handle, chop the greens roughly.
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3
In a skillet over medium heat, melt the lard. Add the onion and fry gently until softened and translucent, about 2 minutes.
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4
Add the chopped greens and stir to coat in the fat. Cook for 1 minute.
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5
Pour in the tomato sauce and stir well. Continue cooking, stirring occasionally, until the sauce reduces and clings to the greens and the flavors are fully combined — approximately 3–4 minutes.
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6
Taste for salt and adjust. Serve immediately.