Start by dicing all your vegetables, in another pot boil your potatoes and carrots for about 5-6 minutes,, drain and set aside
Now In a large pot add your oil, when heated add in your 1/2 onion, whole garlic peeled, jalapeño and tomatoes cook down for 3-4 minutes this will give your soup a beautiful flavor.
Now add in your water and all your seasonings bring to a boil then simmer on medium heat, taste for seasoning. Now add in your your cooked potatoes, carrots, zucchini and simmer for about 10 minutes till veggies are almost tender, now add in your seafood simmer for a few minutes till fish and shrimp are cooked... serve with some fresh lime juice
