Thinly slice or shred cabbage. Use a julienne cutter or grate carrots, thinly slice peppers and green onions and combine all vegetables in a large bowl.
Toast sesame seeds in a small skillet over medium heat, shaking the pan frequently to prevent burning. When they begin to darken and become fragrant, remove from heat immediately and transfer to a small plate to cool.
In a small jar, whisk the remaining ingredients until well combined. Add the toasted sesame seeds and toss with coleslaw.