Seafood Gratin

INGREDIENTS

1 cup

clam juice

1 cup

heavy cream

1/2 cup

plus 3 tbsp. white wine, such as Chablis, divided

3 tbsp

tomato puree

1 lb

raw shrimp (26-30 per lb.), peeled and deveined

8 oz

raw cod, cut into 1-inch chunks

10 oz

cooked lobster meat, cut into 1-inch chunks

5 tbsp

unsalted butter, at room temperature, divided

1 tbsp

all-purpose flour

1 tsp

kosher salt

1/2 tsp

pepper

2 cups

thinly sliced leeks, white and green parts

1 cup

peeled, shredded carrots

1/2 cup

Panko breadcrumbs

1/3 cup

freshly grated Parmesan cheese

1 tbsp

minced fresh parsley

2 cloves

garlic, minced