Prepare the Spice Blend: In a small bowl, combine the smoked paprika, cayenne pepper, garlic powder, onion powder, oregano, thyme, black pepper, salt, and ground cumin. Stir well until thoroughly mixed and the vibrant reds and browns are evenly distributed.

Sauté Aromatics and Sausage: Heat the olive oil in a large frying pan or skillet over medium-high heat. Add the sliced beef or chicken sausage and cook for 5-7 minutes until lightly browned and fragrant, releasing a savoury aroma. Remove the sausage from the pan and set aside. Add the quartered onions and unpeeled garlic cloves to the same pan, stirring occasionally for about 5 minutes until the onions soften slightly and turn a translucent golden hue.

Build the Boil Base: Transfer the sautéed onions and garlic to your large stockpot. Add the chicken stock and apple cider vinegar. Stir in half of your prepared Cajun spice blend until it dissolves, creating a rich, earthy liquid. Bring the mixture to a rolling boil over high heat – you'll see large bubbles breaking the surface with a strong, aromatic steam rising.

Cook Potatoes and Sweetcorn: Once the liquid is boiling, add the baby new potatoes. Reduce the heat to medium-high and cook for about 10-12 minutes, or until the potatoes are just fork-tender. Then, add the sweetcorn rounds and continue to cook for another 5 minutes, until the sweetcorn becomes a brighter yellow and offers a slight resistance when bitten.

Add Shrimp and Sausage: Stir in the cooked sausage slices. Now, add the raw shrimp to the pot. Cook for only 2-3 minutes, stirring gently, until the shrimp turn opaque pink and curl into characteristic 'C' shapes. Be careful not to overcook, as they can become rubbery. You’ll notice a distinct, sweet seafood aroma filling your kitchen.

Finish with Butter and Serve: Remove the stockpot from the heat. Stir in the butter until it melts completely, coating all the ingredients in a glossy, rich sheen. Squeeze in the juice from the two lemon halves. Using a large slotted spoon or spider strainer, carefully transfer all the ingredients from the pot onto a large serving platter or several baking sheets lined with parchment paper. Garnish generously with fresh chopped parsley. Serve immediately and watch everyone dig in!