Preheat the oven to 425F and the pasta pot (or another large pot) from boiling the noodles to medium heat.
Add the butter, onion, garlic, spices, and tomato paste to the pot. Stir to combine until the mixture is sizzling, then sprinkle over the flour. Whisk together to form a paste.
Very slowly pour in the stock, whisking as you go, to create a thickened sauce. Pour in the cream and continue to stir.
Let the mixture come just to a simmer, then stir in the fontina cheese 1 handful at a time until it melts, reserving 1 cup of grated cheese. When the she-crab soup base (and mac and cheese base) is done, turn the stove off.
Add the pasta, crab, and remaining cheese to the pot. Stir gently to combine and taste: add more salt, pasta water, or cream to your preference. The mixture should be saucy but not soupy.
Transfer the mixture to a baking dish and sprinkle with the panko and black pepper.
Bake the she-crab mac and cheese for 15-20 minutes until bubbly, then serve with flaky salt, olive oil, cracked pepper, and lemon wedges.
YES.