I found this recipe in a precious collection from ENO, an online community of schools from around the world. It was submitted by the Borwa Community Junior Secondary School in Botswana.
I wasn't enthusiastic about it ("No spices?"), but it was delicious. The sweetness of the onions and tomatoes was all the spice they needed.
Recipe: Botswanan Greenleaf Vegetable
“Instructions for the preparation: Cut the spinach leaves into small pieces. Slice some onions, tomatoes and peppers. Wash the spinach with clean water. Put the spinach into a pot together with the chopped onions, tomatoes and peppers. Pour half a mug of water in the pot and add some salt and spices and pour 2 teaspoons of oil. Cook for about 20 min. Keep the pot closed until the water dries up serve with rice.”