If using wooden skewers place them in water and let them soak for at least 10 minutes.
Turn on the grill or a grill pan over medium/high heat and brush with some olive oil.
Place the cut yellow onion on direct heat on the grill/grill pan and grill/fry until grill marks appear and the onion starts to get soft. Move to indirect heat and grill/fry until the rest of the dish is done.
Combine the ingredients for the honey sumac dressing in a small bowl.
Remove the skewers from the water and thread the sliced halloumi and sugar snaps onto the skewers. Brush with the honey sumac dressing and place on the grill/grill pan. Grill/fry for 2-3 minutes on each side. Brush the other side when you turn the skewers. Save the rest of the dressing for serving.
Place mixed green leaves on two plates, top with skewers, onion, drizzle with honey sumac sauce and slivered almonds. (You can also dry roast the almonds if preferred).