Cod with Tomatoes

Name: Cod with Tomatoes
Ingredients: 4 Cod Fillets ((about 1-1½ pounds depending on the thickness)); 1 teaspoon Salt (plus a pinch for the onions and tomatoes); ¼ teaspoon Garlic Powder; ¼ teaspoon Black Pepper; 1 tablespoon Olive Oil; 1 tablespoon Butter; 2 cups White Onion (sliced thin (about ½ a medium onion)); ½ cup White Wine; 1 pint Cherry or Grape Tomatoes; 1 tablespoon Lemon Juice (½ a juicy lemon should do it); 2-3 ounces Fresh Spinach (about 2 generous handfuls); Lemon Wedges for serving