"the lot" means all of it.

Lot as a noun can also be used to describe the difficulties in life. Consider this very famous religious song" "When peace like a river attends to my way, when sorrow like sea billows roll Whatever my LOT you have taught me to say It is well, it is well with my soul"

"The lot" means everything you have just mixed, all the ingredients.You could replace "the lot"with ""everything". Freezer is spelled Freezer, not frizer.

Thanks!

Freezer is the correct spelling.