Don't use a strip-type thermometer, which you hold on your baby's forehead, to check your baby's temperature. Strip thermometers only show the temperature of your baby's skin, not her body. It's also best not to use an old-fashioned, mercury-in-glass thermometer.
If your prawns are smaller, spread a piece of aluminum foil or banana leaf on the grill first, then place prawns on top. Or skewer the shrimp with satay sticks (if wood, soak in water first). Baste the prawns the first time you turn them with a little of the leftover sauce. Grill 3 to 5 minutes each side. Prawns are done when the flesh turns from translucent to pinkish-white (and the shells turn a very attractive bright pink).
Preheat grill for medium heat and lightly oil the grate. Place potatoes into a large pot and cover with salted water; bring to a boil. Reduce heat to medium-low and simmer until nearly tender, about 10 minutes. Drain and cut in quarters. Thread 4 shrimp onto skewers, piercing each shrimp near the head and tail, alternating with potato, onion, and tomato chunks; repeat with remaining skewers. Arrange skewers on a platter and coat with olive oil. Season with salt and black pepper.