For a real world example sugar was first synthesized in 1953 https://en.wikipedia.org/wiki/Sucrose#Chemical_synthesis
Carbohydrate synthesis is also a well studied field. https://en.wikipedia.org/wiki/Carbohydrate_synthesis
Many vitamin additives today are artifical. And of course artificial flavoring has vast commercial adoption. In the case of McDonald's french fries this was used to dramatically reduce the amount of saturated fat while maintaining the beef flavor - they are no longer deep fried in beef talow.
We can't yet recreate the texture of a pepper, but we can certainly create a synthetic smoothie with the necessities of life. Organic chemistry is a rich field of study.