Challah is one of my favorite breads. I remember my grandma buying it in the morning and giving it to us for breakfast (we were around 8) and having it with only butter. Because it was still hot, butter would start to melt a bit... Mmmmmmm I can still taste it.
I verify the yeast with warm water + honey, then I throw the whole mess into the bread machine and let it mix/wait/punch down/rise etc. Then I take it out of the machine, form the challah, let it rise again on a sheetpan, egg wash, and bake it in the oven.
You can add more yeast for faster rising but since I use a bread machine I don't bother.
You can throw raisins in without affecting the rest of the recipe. Traditionally challah with raisins was for rosh hashana, and was in a circular shape rather than braided, like polish paska.
Of course you can make sandwiches with it. It’s bread after all.
But it’s not made for sandwiches.
(The recipe I use is 10% sugar.)
(It’s great for making French toast.)