Slice the red onion thinly and place it in a bowl. Add 1/3 tsp of salt and massage until softened. Rinse with water and drain.

Mix the drained onion with sugar, salt, and vinegar. Cover with plastic wrap and let it marinate for 15 minutes. Drain the excess liquid to make onion marinade.

Boil water in a pot and gently add the eggs. Cook for 8–10 minutes, then transfer to cold water and peel the shells.

Mash the boiled eggs roughly with a fork in a bowl. Add mayonnaise, milk, and a pinch of salt, then mix to make egg salad.

Heat a frying pan over medium heat and cook the sausages until browned.