I remembered a story I read a long time ago that had a throw-away topic, not part of the main story but just something that happened in that world, where poor children were begging for paper. They were genetically enhanced to be able to digest wood pulp, as a means to increase their available food sources.
That's not a particularly crazy idea: the ability to digest lactose as an adult is a comparatively new mutation in humans, and not universally shared by all. Another YouTube mad scientist was extremely lactose intolerant and as a young teenager he decided to become a genetic engineer in order to cure himself — and he eventually performed gene therapy on himself from scratch, engineering a virus to introduce the DNA coding for the enzyme protein into the epithelial cells of his stomach. Now he's engineering yeast to produce spider silk.
So, imagine a future where people have such mods, to vastly increase the available food supply. This might be specific to off-world colonists in order to simply their necessary biosystem and agricultural infrastructure, but eventually becomes popular in the general population. Imagine that most things that are biological no longer have inedible parts, and furthermore toxins can be handled as well.
How will this affect cuisine?
If people can eat most any plant material including tough fiber, they won't starve if there's nothing but hay and trees. But I can't imagine chewing something like that would be practical. Cotton will taste slightly sweet (due to enzymes in the saliva liberating small amounts of glucose) but would not be something you would want to eat, due to the texture. How might they include it as an ingredient in cooking?