4 slices thick-cut bacon (cut into 1/2-inch diced (1/2 cup))
2 tablespoons finely minced shallots
1 teaspoon minced fresh garlic
  pinch red pepper flakes (or to taste)
12 ounces dinosaur kale (stems removed, leaves sliced crosswise into 1-inch strips)
1 1/2 cups chicken stock
  salt (to taste)
1 teaspoon Aged balsamic vinegar (or to taste)