Prepare the spinach by trimming the roots, washing thoroughly, and cutting into 4cm pieces. Microwave for 30 seconds at 600W with 1 tbsp water, then cool and squeeze out excess water. Slice the onion thinly and dice the tomato into 1cm cubes.

In a pot, bring the water, salt, pepper, and chicken broth powder to a boil. Add the onion and tomato, cover, and simmer on low heat for 2 minutes. Add the spinach and bring to a boil over medium heat.