The Lighthouse Keeper's Lunch

Mr Grinling the lighthouse keeper tends his light come rain or shine. Every day, Mrs Grinling makes him a delicious lunch and sends it to the lighthouse by a special cable system. But Mr Grinling isn't the only one who enjoys the tasty food, and Mrs Grinling must think of a way to make sure the lighthouse keeper gets his lunch. What would you do if some greedy seagulls kept stealing your lunch?