what is the best way to reheat boiled lobster in the shell?

Like cooking your lobster from the start. In a large pot of boiling water put the lobster in. When it starts to boil again, take the lobster off and crack the shell and dip it with a butter garlic sauce.

1 clove of garlic crushed
1/4 cup of butter

Mix both and fry garlic in butter. fry for 2 minutes and take off the heat. Pour in a bowl or on top of the lobster meat.

whatever you do, don't microwave it. it will taste nasty.

As the lobster is already cooked then I think all you need to do is to stir-fry with some strips of spring onions, chopped garlic and olive oil for 5-10 mins.