Herb Soup With Crab

Name: Herb Soup With Crab
Ingredients: 8 ounces lump crabmeat, picked over; 1 cup chopped mixed herbs (such as parsley, chervil and/or basil); 1 lemon (1 teaspoon grated zest, plus the juice); Kosher salt and freshly ground pepper; 3 tablespoons extra-virgin olive oil; 6 slices white bread, cubed; 4 tablespoons unsalted butter; 1 bunch leeks, white and light green parts only, chopped; 3/4 pound Yukon gold potatoes, peeled and chopped; 1 medium bulb fennel, cored and chopped; 1/2 cup dry white wine; 1/2 cup heavy cream