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1
Separate chard stalks from leaves. Chop stalks finely; shred leaves.
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2
Warm oil in a wide pan over medium heat. Add onion, garlic, and chiles. Fry briefly — 1 to 2 minutes — until softened but not coloured.
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3
Add tomatoes. Cook, stirring occasionally, until the mixture thickens and the raw smell of tomato is gone, about 5 minutes.
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4
Add the stalks, then the leaves, salt, and water. Stir to combine. Cover and cook over medium heat (approx. 150°C / 300°F) for 10 minutes.
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5
Uncover. Raise heat to high. Cook, stirring as needed, until the chard is fully tender and the liquid has reduced to a moist — not watery — consistency.
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6
Taste for salt. Serve immediately.