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1
Heat 1 tablespoon of the oil in a medium saucepan over medium heat until shimmering. Add the onion and garlic, season with salt and pepper, and cook, stirring occasionally, until softened, about 5 minutes.
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2
Add the lentils, stir to combine, and add the chicken broth. Increase the heat to high and bring to a simmer. Reduce the heat to low and simmer, stirring occasionally, until the lentils are just tender and the water has evaporated, about 30 minutes. Remove from the heat and set aside.
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3
Meanwhile, trim the ends from the chard stems and discard. Cut off the stems at the base of the leaves and slice the stems crosswise into 1/4-inch pieces. Place in a small bowl and set aside. Stack the leaves, cut them in half lengthwise, then coarsely chop into bite-sized pieces; set aside.
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4
Heat the remaining tablespoon of oil in a large frying or straight-sided pan over medium-high heat until shimmering. Add the reserved chard stems, season with salt and pepper, and cook, stirring occasionally, until softened, about 5 minutes.
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5
Add the chopped chard leaves, measured salt, and measured pepper and cook, stirring occasionally, until wilted, about 2 minutes. Stir in the red wine vinegar and reserved lentil mixture until evenly combined. Remove from the heat and allow to cool slightly, about 3 minutes.
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6
Sprinkle in the feta and stir to combine. Taste and season with salt and pepper as needed. Serve warm or at room temperature.
