Answer: Smell
Explanation: Smell is one of the five senses by which people take in and also smell the scents through the nose. This means that with the sense of smell, we can smell the scents in the kitchen, but the smell can also remind us of some events, as in this case, which reminded Tammy of picnics when she went out as a kid with her parents. This is given by scientists as a known Proust effect, which means that smell can be a trigger for certain events that are stored in our memory. This is due to the olfactory processing system, so it is enough to smell a certain smell and remember an event that was decades earlier, just because of the smell of a certain scent.