Step 1

In a medium saucepan, cover the brown rice with 2 inches of water and bring to a boil. Cover and cook over low heat until the rice is just tender, about 40 minutes. Drain and return the rice to the saucepan; keep covered.

Step 2

Meanwhile, in a small saucepan, combine the quinoa with 2 cups of water and bring to a boil. Cover the saucepan and simmer over low heat until the quinoa is tender and all of the water has been absorbed, 20 minutes.

Step 3

In a large skillet, heat 2 tablespoons of the oil. Add the onion and cook over moderate heat until translucent, about 4 minutes. Add the carrot and cook until starting to soften, about 3 minutes. Add the shiitake, cover and cook until tender, about 4 minutes. Add the zucchini, season with salt and cook, stirring a few times, until tender, about 3 minutes. Transfer to a bowl.

Step 4

Add the remaining 2 tablespoons of oil to the skillet. Add the broccoli, cover and cook over moderate heat, stirring a few times, until deep green, 5 minutes. Add the kale, cover and cook, stirring a few times, until the broccoli and kale are just tender, 4 minutes. Season with salt. Stir in the other vegetables.

Step 5

In a small bowl, whisk the tahini with the lemon juice, garlic, warm water and crushed red pepper. Season with salt.

Step 6

Transfer the brown rice and quinoa to bowls. Top with the cooked vegetables, diced avocado and bean sprouts. Serve, passing the tahini sauce at the table.