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1
Put on a large pot of water to boil.
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2
Meanwhile, place a medium saucepan over medium heat for about a minute, then add 1 tablespoon of the olive oil and swirl to coat the pan. Toss in the onion and cumin and cook, stirring, for about 5 minutes, until the onion softens. Add the chili, salt, and some pepper and saute for another 5 minutes, or until the chili softens.
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3
Add another tablespoon of oil, if desired, and sprinkle in the polenta, stirring to coat. Reduce the heat to medium-low and saute the mixture for 5 minutes or so, or until the grains become lightly toasty.
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4
When the water boils, add 3 cups, 1 cup at a time, to the polenta mixture, stirring it in, then covering the saucepan between additions so the polenta absorbs it (as if you were making risotto, but with less stirring). This should take about 10 minutes. (Leave the remaining water simmering in the pot on the stove.) When the 3 cups are incorporated and the mixture is tender, 6 to 8 minutes, remove it from the heat and immediately stir in the cheese. Set aside, covered.
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5
Pick up each chard or collard leaf, one at a time, hold it by the stem, and immerse the entire leaf in the boiling water, down to the base, keeping it there until the spine becomes supple enough to bend without breaking, 20 to 30 seconds, depending on the size. Shake off any excess water and pile the blanched leaves on a plate as you go. Pat them dry with towels and, using scissors, trim off the stems at the base of the leaves and discard.
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6
To assemble the packages, place about 1/4 cup of the filling (slightly more for larger leaves; less for smaller) near the bottom of each leaf and roll it up tightly, folding in the sides. Place all the filled leaves seam side down on a plate. If you have leftover filling, keep it handy.
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7
Shortly before serving, place a large (10- to 12-inch) skillet over medium heat for about a minute, then add about 1/2 tablespoon olive oil and swirl to coat the pan. Add the packages and saute on both sides for a total of 5 to 8 minutes, or until heated through. (You can also saute any leftover filling or heat it in a microwave and serve it underneath or sprinkled on top.) Serve the packages hot or warm.
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8
Add an ear's worth of freshly shucked sweet corn to the filling
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9
Garnish with sliced avocado and lime wedges
