For the sauce, whisk together the peanut butter, water, soy sauce, hoison sauce and sesame oil in a small bowl. Set aside.

Cut the ends off the sweet potatoes, so they are flat. Then run them through a spiralizer. (If you don’t have a spiralizer, you can use a julienne peeler.)

Heat a wok or large skillet over high heat and add the vegetable oil swirling to coat. When the oil is shimmering, add the ginger, garlic, and the white parts of the scallions. Cook until fragrant, about 1 minute. Add the sweet potatoes, broccoli, peppers and cabbage. Sauté for 5-6 minutes until the sweet potatoes and peppers are cooked but still crisp and the broccoli is bright green.  

Add the peanut sauce and sauté for 1-2 minutes until it has finished bubbling. Garnish with the green parts of the scallions and peanuts before serving.