In a blender (such as a Vita-Mix), add olive oil, onions, garlic, cashews, jalapeno pepper, lemon juice, nutritional yeast, and Herbamare (or salt). Add water ½ cup at a time (until desired consistency) and blend until smooth and creamy.
Place the sauce into a large deep skillet over medium-low heat. Add the chopped kale, mix well, cover, and simmer for 10 to 15 minutes. Stir every 5 minutes until kale has wilted and sauce is thickened.