Baked Cod with Tomatoes and Chickpeas

Name: Baked Cod with Tomatoes and Chickpeas
Ingredients: 150 grams Cod Fillet; 75 grams Cooked chickpeas (I make these up in bulk from dried and freeze them. You could also use canned or jarred chickpeas); 150 grams Tomatoes (cherry, mi-cuit or fresh (cut into quarters if larger)); 50 ml Dry white wine or Vermouth; 1 medium Onion; 100 grams Frozen Spinach (drained. Or a packet of fresh!); 1/2 tablespoon Olive oil; 2 cloves Garlic (crushed); Salt and Pepper; 1 handful Black olives (optional); 1 Lemon (sliced)