Anne McCaffrey novel, Freedom's Landing.
Gorupears: Not sure why they're called that, other than perhaps they look like pears... and grow in groups or something else, not sure? Original, and I assume it's the name that she gave it rather than the official name. It's got an avocado sized pit. "Nothing from good old Terra rivalled them for taste". Grows in trees surrounded by thorn bushes that rain darts if you disturb them, in, she hypothesises, a symbiotic relationship. "She bit appreciatively into the firm reddish flesh of the fruit and its succulent juices dribbled down her chin onto her tanned breasts."
She's going to gather nuts and dry gorupears on the rocks by the river for the cold season.
She survives by watching what the avians eat and doing skin tests on everything. (She's on the run from the aliens who enslaved her and many other humans).
"She wrinkled her nose at the half eaten pear. They were mighty tasty but a steady diet of them left her hungering for other basic dietary requirements."
"Her term in the food preparation unit of her 'master' had given her other commodities to look for- though few of those grew wild in this jungle. Still, there were little yellow-scaled fish from the river that had provided her with both protein and exercise."
Later she has nutrient bars that are really hard to eat without water apparently but they do anyway. And aliens that live with them have deficiencies in their diet that they can't find in the natural environment of the planet that she and a bunch of slaves of different species are taken to and dropped at. They find grain in silos (dun dun DUN) when it's supposed to be an uninhabited planet, and start making unleavened bread (and apparently then the scientists create yeast? ) They eat 'rock squats' which are alien creatures that live on rocks. mm, roast rock squat!
They find some foods that make her lips tingle but the aliens greatly enjoy. The aliens also love these poisonous thorns that almost kill one of the main characters.
They create some sort of drink that has a minty aftertaste.