1. Preheat oven to 375 degrees. In a cast-iron skillet, cook pork over medium, breaking up meat with a wooden spoon, until browned, about 7 minutes. Add onion and Swiss chard stems, increase heat to medium-high, and saute until translucent, 8 to 10 minutes. Stir in Swiss chard leaves and cook until wilted, 2 minutes. Stir in 2 tablespoons cornmeal, 1/4 cup Parmesan, and 1 1/2 cups water and bring to a rapid simmer. Cook until liquid thickens, stirring occasionally, about 14 minutes. Season with salt and pepper. Remove from heat.

2. In a small saucepan, bring 2 cups water to a boil. Whisk in remaining 3/4 cup cornmeal and cook, whisking constantly, until mixture thickens, about 2 minutes. Stir in 1/4 cup Parmesan, season with salt and pepper, and spoon over pork and greens. Sprinkle with remaining 1/4 cup Parmesan, transfer to oven, and bake 20 minutes. Heat broiler and broil until top is golden brown and mixture is bubbling at edge, 2 minutes.