Start by preparing the pie crust if you're using a homemade version. Roll out the dough and place it in a pie dish. Once the crust is ready, chill it in the refrigerator for 10-15 minutes to prevent it from breaking during baking.
Thinly slice the red onion into rings, and slice the olives. In a bowl, flake the tuna with a fork.
Crack the eggs into a bowl, add the heavy cream and milk. Season with salt and pepper, then whisk well to combine.
Add the tuna, red onion, and olives to the egg mixture. Mix thoroughly to ensure all ingredients are evenly distributed.
Pour the mixture into the prepared pie crust, spreading it evenly. Bake in a preheated oven at 350°F (180°C) for about 30-35 minutes, or until the top is golden brown.
Let the quiche cool slightly before slicing and serving.
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