Notes:
The number of mangoes needed depends on the type of mango you use. I like the smaller Champagne mangoes, so I used 8 mangoes. If you use one of the larger varieties you may not need as many.
The mango syrup will keep in the refrigerator for two weeks or more.
Measure the pan that you will use to assemble the tiramisu and check it against the size of your sheet pan. One half sheet pan will make two layers. You may be able to cut each of those layers in half and get four equal layers which will fit in your tiramisu pan. If not, double the recipe and make two sponges.