2 big bunches (about 1-1/2 pounds) leafy greens: Swiss chard, lacinato kale, mature spinach or arugula, beet greens, or a combination of any of the above, well washed
2 tablespoons olive oil, plus additional for toasting bread
1 clove garlic, minced
Pinch red pepper flakes
Lemon juice, to taste
4 slices good bread (see note)
Parmesan chese, shaved, grated, or crumbled (optional)
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