In a food processor, add the cashews, add water to get a smooth consistency, about 1/4 cup. Add lemon juice, and salt, blend until smooth. You might have to keep adding water until it blends smoothly.
Transfer the cashew cream into a bowl, scraping the sides. Add chipotle pepper with the sauce, mustard, maple syrup, and salt. Fold until well mixed. Adjust the seasonings if needed.
Toast the whole grain hamburger bun, if adding cheese, place the black bean burger with the cheese on top back in the oven for 30 seconds or until the cheese melted. Assemble your bean burger, spread aioli on the bun, add the bean burger, sliced tomato and leafy green lettuce on top. Add pickles if you want. Save the leftover aioli for next time.
