Bring a large pot of water to a boil. Salt the boiling water generously, and add the garlic and shallots. Boil for 2-3 minutes, stir in the kale and cook for another ten seconds. Don't overcook. Working quickly, use a slotted spoon or strainer to fish the greens, garlic, and shallots from the water. Use a food processor to puree the ingredients along with the olive oil and goat cheese. Add a couple tablespoons of hot pasta water if needed to thin things out if needed. Then season with a touch of salt and plenty of black pepper. Taste. Depending on your goat cheese, you might need a little extra acidic oomph if your sauce is a bit flat. If so, add fresh lemon juice a bit at a time until you're happy with it the sauce. Set aside.