We had this a week ago and it was very good.
1tsp balsamic vinegar
2 tsps soy sauce
6 oz. of chopped tomato
Preheat oven to 400. Take 12 inch squares of foil and brush them with olive oil. Lay a layer of spinach leaves on them. Put a fillet on top of the spinach. Mix a tablespoon of olive oil with the vinegar and soy sauce in a bowl. Crush a garlic clove into it. Add the tomatoes to the mixture and put on top of the fillets. Fold the foil into pckets and back 15-20 minutes. Cool for 5 minutes and eat!
The recipe also adds green onions when you add the tomatoes, but I forgot to buy some. Salmon was on sale, so that was a plus.
This recipe is also approved by my husband and toddler. We were joking about how some kids don't eat spinach, but Margaret was eating it up. Of course, when we tried the spinach we realized that it did taste really good. Best tasting cooked spinach ever. Maybe salmon is spinach-enhancing? If more kids ate spinach cooked with salmon, there would be a lot less spinach hate in the world.