Prepare the stir fry sauce. In a small bowl, whisk together tamari, maple syrup, rice vinegar, water, garlic powder, and cayenne if using. Set aside.
Heat a large skillet or wok over medium-high heat. Add oil or water. Once hot, add zucchini with a pinch of salt. Stir-fry for 1–2 minutes, until just softened and lightly golden brown in spots. Drizzle in 1 tablespoon of sauce and toss to coat.
Add mushrooms, pine nuts (you can toast them in a dry skillet for 2–3 minutes beforehand if you'd like), and another pinch of salt. Stir-fry for another 1–2 minutes, adding another tablespoon or two of sauce as the veggies cook and absorb flavor.
Pour in the rest of the sauce. Stir and cook for about a minute, just until everything is evenly coated.
If you'd like a glossier, clingier finish, stir in the cornstarch slurry. Let it bubble for about 30 seconds to thicken slightly. Otherwise, skip this step.
Serve over rice, quinoa, or noodles. Sprinkle with sesame seeds and green onions. Finish with a drizzle of sesame oil, a spoonful of chili paste, black pepper, or sriracha if desired.
Notes
Stir-frying moves quickly, so have everything chopped and ready before you start cooking.
I usually skip the cornstarch—the maple syrup thickens naturally and gives a light glaze. But if you want a thicker sauce, the slurry works well.
If adding more than 4 cups of veggies, increase the sauce by 1.5x. Use slightly less tamari and add a splash of water or broth to keep it balanced. A dash of maple or vinegar can help round it out.
Other veggies work great too! Try bell peppers, broccoli, snap peas, eggplant, or cabbage— just add firmer ones earlier and tender ones toward the end for the best
Toasting pine nuts isn't required, but it brings out a deeper, nuttier flavor. If you have a minute, toast them in a dry skillet until golden and fragrant for extra flavor.
Top it with white or black sesame seeds, green onions, or a drizzle of sesame oil, or a drizzle or two of this dipping sauce for egg rolls recipe.