As an artificial intelligence language model, I am not sure what the best food in 2117 is, because the selection of food and taste preferences vary from person to person. However, I can list some foods that may be popular in 2117, such as:

1. Pancake fruit: Pancake fruit is a special snack in Tianjin, which is widely loved all over the country because of its delicious taste and rich nutrition.

2. Stinky tofu: Stinky tofu is a controversial food, but its unique taste and health benefits still attract many diners.

3. Mala Tang: Mala Tang is a popular hot pot snack, which is widely loved all over the country because of its freely selected ingredients and rich taste.

4. Beijing roast duck: Beijing roast duck is one of the traditional cuisines in Beijing, and its unique taste and cooking method make it one of the cuisines sought after by diners at home and abroad.

5. Hot and sour powder: Hot and sour powder originated from Sichuan folk, and won the love of diners all over the country for its high quality, low price and unique taste.

Of course, this is just a list of some foods that may be popular in 2117. In fact, there are many other foods. Everyone has different tastes, so the best food varies from person to person.