MIGA  :  crumb

                               (The soft center of bread)

figuratively :  substance, essence, basis, core

informally : the nitty - gritty

The miga sandwich is at the epicenter of quotidian Argentine cuisine.

Take two pieces of un-toasted white bread, cut off the crust and put ham & cheese in the middle.  You can layer it if you like. 

The traditional version and the many variants on the theme constitute a good portion of the offerings of the majority of local delis, bakeries, bars and restaurants.

Variants include the ham & cheese & tomato miga sandwich, the tuna miga sandwich, the cheese & tomato miga sandwich, and the toasted ham & cheese miga sandwich.   There are more.

As you thus see, miga is synonymous with daily survival in this great land and I shall record my attempts (some failed) at such.  

When necessary, I repeat to myself a polish proverb (I am part polish after all) which refers to other people's nonsense:

 Not my circus, not my monkeys.