Crumble it on the bbq plate from the smooth side and bake it at 320° for 15 minutes, first level from the bottom.
Separately, prepare the salted caramel: in a saucepan, bring the sugar to caramelize to a temperature of about 320°, pour in the water and then the cream.
Cook on a low flame for about 10 minutes while keeping stirred.
Bring the bbq griddle to temperature , cook the pineapple at a temperature of 480° for 2 minutes per side.