Step 1

Preheat the grill to medium-high heat.

Step 2

Soak 6 skewers in water for at least 10 minutes and up to 30 minutes. This is critical to ensuring they don't catch fire on the grill.

Step 3

In a small saucepan on the stovetop over low heat, warm the teriyaki sauce and the sugar, stirring until the sugar dissolves.

Step 4

Thread the bell peppers and onions onto the prepared skewers, 2 pieces of the peppers for every 1 piece of the onions.

Step 5

Grill the vegetables until charred in spots and lightly cooked, about 6 minutes.

Step 6

Baste both sides of the lightly cooked vegetables a few times with the teriyaki mixture, turning often so that it chars in spots, for about 1 minute.

Step 7

Carefully transfer the cooked vegetable skewers to a platter.

Step 8

Drizzle the skewers with the remaining glaze.

Step 9

Sprinkle the skewers with the sesame seeds.

Step 10

Serve.