Percy locates Grover through his empathy link in Central Park and finds him under a giant elm tree . Percy wakes him up by yelling , ( via empathy link ) `` FOOD , PANCAKES ! '' . Percy locates Grover through his empathy link in Central Park and finds him under a giant elm tree , whereupon Percy wakes him up by yelling , ( via empathy link ) `` FOOD , PANCAKES ! ''