Combine all the ingredients for Huli sauce in a bowl with a whisk until smooth. Cover and refrigerate for up to seven days.
Heat the oil in a large sauté pan over medium-high heat. Add all of the vegetables and season with salt and pepper. Cook for 4-5 minutes, stirring frequently until the vegetables are beginning to soften.
Reduce the heat to low and stir in the Huli sauce. Continue cooking for 2-3 minutes until the vegetables are al dente. Serve immediately