Maxim Tomatoes are large red tomatoes with a black "M" on the front of them. The "M" likely standing for "Maxim".
Super Smash Bros. series
Maxim Tomatoes also appear in the Super Smash Bros. series where, like the Kirby series, they act as recovery items. However, unlike the Kirby series, they don't fully heal a character; instead healing a set amount from a character's damage meter. In the original Super Smash Bros., they healed characters of 100% damage, while in later games after Super Smash Bros. Melee they only heal 50% damage.