Cook the bacon in a large Dutch oven or pot over medium-high heat, stirring occasionally, until crisp, about 5 minutes. Remove with a slotted spoon and drain on paper towels.
Add the potatoes and leek to the drippings in the pot and cook, stirring, until the leek is slightly softened, about 3 minutes. Add the garlic, herbs, 1/4 teaspoon salt and a few grinds of pepper. Cook, stirring occasionally, until the vegetables are slightly browned, about 2 minutes. Add the chicken broth and 4 cups water and bring to a simmer; cover and cook 15 minutes. Add about three-quarters of the kale; continue cooking, covered, until wilted, about 5 minutes. Stir in the Worcestershire sauce.
Meanwhile, preheat the broiler. Toss the remaining kale with the olive oil on a baking sheet; season with salt and pepper. Broil until crisp, about 3 minutes.
Thin the sour cream with a splash of water. Working in 3 to 4 batches, puree the soup in a blender until smooth; reheat if needed. Serve topped with the sour cream, kale chips, bacon and almonds.
Photograph by Charles Masters
When blending hot liquid, first let it cool for five minutes or so, then transfer it to a blender, filling only halfway. Put the lid on, leaving one corner open. Cover the lid with a kitchen towel to catch splatters, and pulse until smooth.