Steak With Caramelized Onions

2 lbs. sirloin steak;

1 large onion, cut into thick strips;

Cooking fat;

Sea salt and freshly ground black pepper;

½ cup homemade ketchup;

¼ cup extra virgin olive oil;

¼ cup balsamic vinegar;

¼ cup coconut aminos;

2 tbsp. raw honey;

Sea salt and freshly ground black pepper;