Place corned beef brisket in large crock pot

Add water until brisket is completely covered

Cook on high 4-6 hours

Once cooked through, remove brisket from crock pot to cool, leaving water

Dice potatoes and onion and boil for 10 minutes

While potatoes are cooking, dissolve corn starch in a 1 tbsp of warm water and add to crock pot, mix well

Finely chop corned beef

Drain water from potatoes and onions

Add meat, potatoes, and salt to water mixture in crock pot

I like to turn it on low for about an hour for all the ingredients to soak up seasoning, but it can be eaten immediately