Start preparing the barbecue for cooking this dish on a medium heat.
This means putting the grill of the barbecue about 6 inches above the main heat source.
Also place the wooden skewers in some water.
Whilst the barbecue is heating up you can now prepare the sauce for the kebabs.
In a bowl place 1 tablespoon of lemon juice along with ½ teaspoon of its peel.
To this then add the olive oil, Dijon mustard and salt and mix well together.
Then put to one side ready for use later.
Now on to each of the wooden skewers you need to thread 3 tomatoes and 2 scallops alternately.
You should start and finish with the tomatoes.
Next brush the kebabs you have just made with some of the sauce you made earlier and place on the barbecue to cook.
Each kebab will need to cook for between 7 and 9 minutes and should be turned over several times.
After this time has elapsed brush the kebabs with the remainder of the sauce and then cook for another 5 minutes or more remembering to turn them over frequently.
The kebabs will be ready to consume when the scallops have turned opaque right through.
Once the kebabs are cooked served to your guests immediately with a little green salad and some crusty bread.