Not sure which spice mix you have on hands. I think most of their products uses chili powder as a main ingredient. I would still use the cumin and use Cui Hong to replace chili. Because cumin is a main seasoning here and chili is much less prominent.

Thanks for the tip!

I only use the onion to add flavor to the marinade, so I usually discard them later. Especially when I want a quicker marinating, I cut the onion quite small and they will wither after marinating. But you can definitely throw them on the grill if the onion pieces are on the larger side.

I’m so happy to hear you and your son enjoyed the dish! I think the seasoning is on the saltier side and was thinking about tweaking it. But my friends insisted to keep them salty so it’s more like the Chinese street style lol I think sea salt is a better idea.
It’s a good call on mutton. I just looked it up in dictionary and realized that we usually use mutton in China. The cuts we could buy from a grocery store are all from mature sheep. Lamb is a very special thing and it’s possible to find in a restaurant, but quite pricey.