Seafood Stock

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2 tablespoons good olive oil

Shells from 1 pound large shrimp

2 cups chopped yellow onion (2 onions)

2 carrots, unpeeled and chopped

3 celery stalks, chopped

2 garlic cloves, minced

1/2 cup dry white wine, such as Pinot Grigio

1/3 cup tomato paste

10 sprigs fresh thyme

Kosher salt and freshly ground black pepper