sentence: cut the beef in to 1 inch cubes sentence: mix tsp salt 2 tsp brown sugar tsp lemon zest tsp cumin powder tsp paprika  tsp pepper tsp coriander powder sentence: add 1/3 cup olive oil 2 tsp of tomato paste 5 finely chopped garlic cloves to and whisk to combine sentence: transfer cup of marinate mixture to ziplock bag and add the beef keep the leftover marinate mixture in the bowl sentence: massage the marinate with hands sentence: cut off 1 lbs summer squash and 1 onion into 1 inch pieces sentence: cut 8 ounces of cremini mushrooms sentence: add all the vegetables to the leftover mixture and toss them around to mix well until they are coated sentence: heat the grill medium high sentence: thread the marinated beef and vegetables on to 10  12 inches skewers separately sentence: put the skewers on to the grill close the grill and cook turning the skewers every 2  3 minutes sentence: take the beef skewers off when they are lightly charred allover sentence: cover the skewers loosely with foils to keep them warm sentence: continue to cook the vegetable until they are charred all over