Ranch Shrimp Skewers

In a large bowl mix the dressing mix and oil.

Cut potatoes into small chunks. Toss the potatoes, tomatoes and shrimp well in the dressing mix.
Cut onions into chunks. Do not separate the layers. Do not toss the onion chunks in the dressing mixture (they will all fall apart).

Prepare 8 potato skewers alternating potatoes and onions. Prepare 12 shrimp skewers with 2 tomatoes each and dividing the shrimp.

Heat the grill to medium-low. Add a sheet of foil over the hot grates and add the potato skewers. Cook the potato skewers on top of the tin foil, turning, until potatoes are cooked (about 30 minutes). Then lower the heat to low and add the shrimp skewers to the grill. Cook the shrimp skewers about 10 minutes, turning 2 or 3 times, until the shrimp are cooked. Remove all of the skewers from the grill and serve.