serves 6–8; adapted from Julia Child Mastering the Art of French Cooking and Belle Année on Food52
Heat olive oil in stockpot over medium heat (if using olive oil from preserved dried tomatoes, remove the tomatoes, slice, and reserve). Add the fennel, onion, shallot, and cook until softened, but not browned, 5 or 10 minutes, stirring now and then.
Stir in the tomato paste or chopped tomatoes and any reserved dried tomato slices. Cook for a couple minutes, stirring.
Add wine to deglaze the pan then add the fish stock, saffron-water, orange zest strip, and fingerling potatoes. Bring to boil, lower heat, and simmer for 30 minutes.
Bring soup to a rapid boil about 15 minutes before serving. Add firm-fleshed fish (and crab or lobster, if using), bring back to a moderate boil, cook for 5 minutes then add the mussels and clams and boil, partially covered, for an additional 5 minutes.
At this 10-minute mark, add tender fish, scallops, and shrimp and gently simmer for 5 additional minutes, uncovered.
Discard any mussels or clams that have not opened. Taste the broth and decide if you want to add the Pernod or leave it as it is.
Serve in warmed bowls and float a rouille topped crostini in each, have more available at the table for people to add as they wish.
Place saffron-water, peppers, bread crumbs, garlic, vinegar, harissa, and salt in a food processor and purée while drizzling in olive oil.
If you have a blender, simply whirr everything together at once, it will still turn out great.