Step 1: Preheat oven to 350 degrees F. Grease/butter a large casserole dish.
Step 2: In a large saucepan, melt butter over medium-low heat until melted. Add in mustard, onion, garlic, Worcestershire sauce, paprika, salt, pepper and tabasco sauce; cook stirring for 3 minutes. Add in flour; cook 1 minute. Carefully add in the half and half cream, whisking constantly until thickened, adjusting the salt to taste. Remove from heat and add/mix in the gruyere cheese until melted. Transfer the mixture into a large bowl.
Step 3: Mix in the seafood and olives. Season with more salt and pepper if needed. Transfer mixture to prepared casserole dish.
Step 4: Brush the top of the casserole with lemon juice. Sprinkle grated Parmesan cheese on top. At this point the casserole may be refigerated, and baked later. Bake for about 30 minutes, or until hot and bubbly.
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