Take your beef and cube up into equal sized portions. You want them to be the same size so they finish at roughly the same time. In a mixing bowl combine the marinade ingredients ensuring the sugar is dissolved and the garlic powder is mixed well. This marinade is for ~1-2 lbs of cubed beef.If you need more marinade, make more vs scaling. 3 tbsp Neutral oil, 3 tbsp Low sodium soy sauce, 1 tsp table ground black pepper, 1.5 tbsp Worcestershire sauce, 1 tbsp Evaporated Cane sugar, 1 tsp garlic powder, 1 whole fresh lemon (just the juice)
To a gallon storage bag add your beef and marinade. Marinate for 1-4 hours. DO NOT marinate overnight - the acid in the lemon juice will negatively impact the exterior of the beef and turn it to mush. If you're using bamboo skewers - either soak in water a day in advance OR soak in water while the beef marinates.
Get your grill to ~350-375F.
Chop up your choice of veg - I used Vidalia onions and red/yellow bell peppers. Cut these into squares so that they're roughly the same size as the cubed beef. Take your beef and veg and put them onto the skewers, alternating veg and beef.
Take your beef kebabs and put onto the grill, directly over the fire.
I prefer to flip every 30-45 seconds vs searing too long in one spot - if you notice some spots getting too much love, rotate the skewer as you're cooking so other spots get more love.
In terms of "doneness" all you're looking for is some char on the exterior of the meat and veg and for the beef to take on a brown-ish hue. For me with my setup, this took ~20 minutes but your setup might be different and may cook faster. Once you're happy with the beef, take off to rest for 5 minutes and then enjoy!