Love Nugget

The Love Nugget is a treasure found in  and  and is actually a red, ripe. It is found on the first sublevel of the Citadel of Spiders in Pikmin 2, and in the Hero's Hideaway and Giant's Hearth in Pikmin 4.

Collecting the treasure in Pikmin 2
There are a few Shearwigs that may try to kill Pikmin on the way to the ship's pod, but it's still rather easy to obtain.

Hero's Hideaway
There are two Love Nuggets lying at the bottom of the sink on the northeastern edge of the overworld, submerged underwater. To collect them, you must throw 10 Blue Pikmin at each treasure, or 10 of any Pikmin after pressing the nearby button which drains the sink of its water.

Giant's Hearth
There is a Love Nugget lying on the ground near the center of the overworld. It is surrounded by bundles of dried plants, so you must throw a fire starter at it to free it. To collect this treasure, you must throw 10 Pikmin at it.

Trivia

 * The Love Nugget is one of two fruits in that does not appear in, the other being the Combustion Berry.
 * Olimar's journal entry for the Love Nugget likely references the famous debate around if tomatoes are a fruit or a vegetable.