5 slices of white american bread= 250 g
Put them in a food processor
Powder the mastic gum. Unless you have it in powder... Easier to use. And if you don't have it it is not a problem.
The mastic powdered
In a casserole put the bread crumbs and 650 g double whipping cream + (200 g double cold cream in a container on the side.)
Cover with cling film. The film should be placed in contact with the cream so it will not form a crust while cooling. When It Is cold, refrigerate and it will b ready to serve. Or to use.
Put in a recipient