1 tablespoon extra-virgin olive oil
1 pound pork tenderloin, trimmed and cut into 1-inch pieces
3/4 teaspoon salt
1 medium onion, finely chopped
4 cloves garlic, minced
2 teaspoons paprika, preferably smoked
1/4 teaspoon crushed red pepper, or to taste (optional)
1 cup white wine
4 plum tomatoes, chopped
4 cups reduced-sodium chicken broth
1 bunch kale, ribs removed, chopped (about 8 cups lightly packed)
1 15-ounce can white beans, rinsed (see Tip)