Smoky Spanish chorizo stew with spinach and chickpeas

Ingredients

• 4 tablespoons of extra virgin olive oil
• 1 onion (sliced fine)
• 5 cloves of garlic (chopped fine)
• 14 oz. 400g of fresh chorizo sausage, cut into 1-inch pieces
• 2 potatoes (cut into 1-inch cubes)
• 17 oz. 500g frozen spinach
• 17 oz. 500g jar of prepared chickpeas
• 14 oz. 400g can of diced tomatoes
• 16 fl oz. (500ml of vegetable or chicken stock)
• 2 tablespoons of ketchup
• 1 tablespoon of white wine vinegar
• 1 heaped teaspoon of Spanish La Vera smoked paprika
• 1 teaspoon of garlic powder
• 1 teaspoon of salt
• Cracked black pepper for seasoning
• 1 lemon (for garnish)