Step 1

Combine ketchup, sugar, tamari, vinegar, sesame oil and red pepper flakes.

Step 2

Heat a 10-inch skillet on medium-low, add olive oil and shallots and sauté until tender. Add garlic and ginger and cook for 1 minute before pouring in the sauce. Simmer for 8 to 10 minutes then transfer to a dish to cool completely. (see notes)

Step 3

Once the sauce has cooled, pour 1/2 to 3/4 cup over the chicken and toss to coat. Reserve 1/2 cup for brushing and the remaining sauce can be served on the side.

Step 4

Grease grill grates with olive oil before preheating to 400°.

Step 5

Thread the chicken onto skewers (soak wood skewers for 20 minutes prior to using) and place on the grill, cover and cook for 5-7 minutes.

Step 6

Use tongs to turn the chicken skewers, brush with sauce. Cover and continue to cook for 5 to 7 more minutes. Turn, brush again with more sauce and remove to a platter to serve.