Answer:
What has one hand longer than the other, and goes on all day and night?
I start in little but I end in full, you'll find me in half and complete.
This is meat from the upper part of a pig's leg salted and dried or smoked, often enjoyed in a sandwich.
Makes dough grow
I can be as thin as a picture frame but my insides have many things you can see.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.