The first time I went to my boyfriend's house, his mother treated me to 5 kinds of fruit, and the way they were eaten was quite unexpected

The first time I went to my boyfriend's house, his mother prepared 5 kinds of fruit to treat me, and I never expected this way of eating them!
Speaking of eating fruit with dipping sauce, the only thing I can think of is cucumber on the dining table dipped in soy sauce, and that is actually a very tasty cold dish. For many years, in my mind, fruit was a delicacy that could be enjoyed on its own without any other pairing, until I met my future mother-in-law, who can simply be called a mother-in-law of the highest order! The first time my boyfriend took me to his house, his mother prepared a whole table of fruit, which made me quite happy, but when we were about to eat, she actually brought out a small dish of soy sauce for me to dip it in. This was even scarier than dark cuisine, and it was really too much for me to handle!
In summer there are so many kinds of fruit, and most of my favorite fruits are in season in summer too, but although I eat fruit often, eating it dipped in soy sauce is truly something I have never seen in my life! Especially my favorite grapes paired with soy sauce; just smelling it almost made me throw up, let alone feel like eating it!
And there is also lychee. Lychee itself is sweet, but soy sauce is salty. Having lychee with this dipping sauce left me not knowing what to say. I wonder whether this is a regional way of eating?
Take a guess, after being dipped in soy sauce can you still tell which kind of fruit this is? Although I do not like mango, my mother-in-law ate it with such enjoyment. She said that when other fruits are eaten with the dipping sauce along with their peel, the sauce does not penetrate, and only mango flesh, once soaked in soy sauce, lets the soy sauce go deep into the flesh, making it the most delicious. I was thinking it is a good thing she did not use watermelon with the sauce, otherwise I would have a shadow over eating watermelon from then on!
Right after talking about mango, she then took banana to dip and eat too, and said with a perfectly serious face that eaten this way it has a bit of a mustard taste! It seems this was summed up only after eating a lot of it. Anyway, I could not get it down. If any friends are interested, you can give it a try and see whether there really is a mustard taste!
Cherry tomatoes dipped in soy sauce are not even the strangest thing, but if eaten this way often, it is definitely bad for your health. After all, the salt content in soy sauce is very high, and taking in too much salt over a long time can easily cause hardening of the blood vessels. I have also heard that in some places people even eat fruit dipped in chili. I wonder whether your area has this way of eating? But even if you have a strong taste, do not try it casually. Fruit is still best eaten light.