Turn on the oven and preheat it to 350 degrees Fahrenheit. 

Remove the lobster from its shell.

Place the leftover lobster in an oven-safe dish and add some leftover lobster sauce, butter, or stock to it. This will ensure that the reheated lobster is juicy. 

Cover the dish with aluminum foil and put it in your preheated oven.

Heat the lobster until it’s warmed through. This should take somewhere around 10 minutes or longer depending on the efficiency of your oven.

Take the dish out of the oven and serve the lobster right away!