Ice crystals form when there is either too much water content or the time it takes to freeze is too long.  The best way to combat those large ice crystals from forming is by making sure the strawberry ice cream is covered well (u003cemu003ethink plastic wrap or wax paper on the surface of the ice creamu003c/emu003e). Additionally, be sure you are putting the ice cream into a really cold freezer and letting it set without opening the freezer for at least 4 hours.