Before You BeginPreheat and prepare your cookware as needed. Cooking times and results may vary depending on your equipment and ingredients. Heat olive oil in a large pot over medium heat. Add onion, carrots, and celery. Cook until softened, about 6–7 minutes.
Stir in garlic and thyme and cook for about 1 minute, stirring gently.
Add potatoes, vegetable broth, and bay leaf. Bring to a gentle boil, then reduce heat and simmer until vegetables are tender when pierced with a fork.
Blend soaked cashews with water until completely smooth.
Carefully transfer about 1 cup of hot soup to a blender. Vent the lid slightly and blend on low speed until smooth.
Return the blended soup and cashew cream to the pot. Stir well and adjust consistency with additional broth if needed.
Season with salt, pepper, and lemon juice to taste. Simmer briefly and serve warm.