Heat the dutch oven and 1/4 cup olive oil over medium heat. Dice white onion and fennel bulb and add to the dutch oven, season, and simmer until translucent.
Mince garlic cloves and add to the pot, season with salt and pepper, and stir through.
Add tomato paste to the dutch oven and stir through.
Deglaze the bottom of the pot with the white wine. Allow to simmer until the wine has reduced by half.
Heat your skillet over medium high heat and make sure your scallops are as dry as possible for a good sear. Add 1 tbsp olive oil to the skillet and season your scallops with salt, then place your scallops flat against the cooking surface pressing them down lightly.
While the scallops are searing, dice bell pepper and add to dutch oven along with can of diced tomatoes.
Flip scallops once the first side is nicely seared and cook the second side then remove and set aside for now.
Roughly chop parsley and stir into the Cioppino broth. Add bay leaf and thyme then add seafood stock and bring to a low simmer. Simmer, covered, for 45 minutes to 1 hour.
Make the risotto while the Cioppino broth is simmering.
Clean and crack the crab and peel and de-vein the prawns. Keep refrigerated until the Cioppino broth has finished cooking.
Once the broth has simmered for enough time, remove thyme and bay leaf from the Cioppino broth.
Add cracked crab, mussels, clams to the Cioppino broth and stir through. Gently fold the shrimp and scallops into the Cioppino.