Kale With Onion, Celery, And Tomato - cooking recipe

Ingredients

1 tablespoon olive oil
1 medium onion, chopped
2 -3 stalks celery, chopped
8 ounces vegetable stock
1 1/2 teaspoons salt (or to taste)
1 teaspoon pepper (or to taste)
1 bunch kale, chopped (leaves only)
1 medium tomatoes, chopped

Preparation

Heat the olive oil in a medium-sized pot.
Saute the onion and celery over medium-heat, about five minutes, to release flavors.
Reduce heat, stir in kale (note: will shrink a lot).
Add stock, salt and pepper.
Cook, covered, on medium heat for 30 minutes, stirring every 10.
Add tomato during the last 5 minutes.