How to make lemon and parsley crusted hake fish

Dijon mustard and lemon zing make this a truly memorable dish. For this recipe, you will need: 1/2 loaf brioche, 1 cup butter, zest from 4 lemons, 1 bunch fresh parsley, 4 Roma tomatoes, olive oil, 1 cup dry white wine, 1 shallot, 1/4 cup champagne vinegar, 1 cup heavy cream, 1 tablespoon Dijon, cayenne better, butter, 5 ounces of hake per serving, 2-3 small Yukon gold potatoes, 4-6 beet tops, salt and pepper.