Mixed vegetable and spare ribs soup

Ingredients:

100g spareribs
1 liter water
1 tomato
1 onion
1 small carrot
1 potato
1 tablespoon oil
Seasoning:

1 teaspoon salt
1 teaspoon sugar

Preparation:

Prepare boiling water.
Wash the spareribs.
Place them in the boiling water and simmer for 20 to 30 minutes.
Peel the onion.
Scrub and peel the carrot and potato.
Rinse all the vegetables.
Dice into cubes.
Saute the onion, carrot and potato in 1 tablespoon oil.
Add them to the soup and simmer for 10 minutes.
Add the tomato and simmer for another 5 minutes.
Add seasoning and serve hot.