Place cashews, water, tofu, lemon juice and agave in the blender. Puree until very smooth, scraping down the sides with a spatula often to make sure you get everything. This can take up to 5 minutes depending on the strength of your blender.
Add the onion powder, veg broth powder, garlic powder and salt, and pulse to combine. Transfer mixture to a bowl and mix in the dried dill. Taste for salt and seasonings. Seal tightly and chill for at least an hour. The longer you let is chill, the firmer it will get.
Before serving, taste one last time and adjust seasonings as needed. Serve!