Swiss chard is loaded with vitamin A for bright, gorgeous eyes, vitamin K for strong bones, and antioxidant vitamin C for glowing skin. What's not to love about this sexy green? If you can't find pumpkin seeds, try sunflower seeds.
Place the chard on your cutting board. Use a sharp knife to cut out the colorful stems from the leaves. Slice the stems crosswise into ¼-inch pieces and place them in a bowl. Working in batches, stack the greens, roll them into a thick cigar shape and slice them crosswise into ¼-inch-wide ribbons.
Toast the pumpkin seeds in a small skillet over medium heat, shaking the pan often, until fragrant, toasty-brown, and plump, 3-4 minutes. Transfer to a small plate to cool and set aside.
Heat the oil in a large nonstick skillet over medium-high heat. Add the onion and salt and cook, stirring often, until it begins to soften, 3-4 minutes. Stir in the chard stems and cook until they're starting to soften, about 4 minutes. Add the greens and cook, stirring often, until they begin to wilt, about 4 minutes longer. Stir in the raisins and turn off the heat. Sprinkle with the lemon juice and turn the greens out onto a serving platter. Sprinkle the pumpkin seeds over the top and serve.