Step 1

Bring 1 inch of water to a boil in a large pot fitted with a steamer basket. Add broccoli, cover and cook until tender-crisp, 3 to 4 minutes.

Step 2

Meanwhile, heat oil in a large skillet over medium-high heat. Add bell pepper, onion and garlic; cook, stirring often, until the vegetables begin to soften, about 3 minutes. Add the steamed broccoli and cook, stirring, for 3 minutes.

Step 3

Whisk peanut butter, tamari, vinegar, sugar and cornstarch in a small bowl until smooth. Stir into the vegetables. Cook, stirring, until the sauce thickens, about 1 minute. Sprinkle with sesame seeds.