Rotovaps are certainly one way to do it, and you can often find used ones on eBay for a lot less than the new list price.
Another way is to simply macerate (soak) measured amounts of material in measured amounts of solvents for measured amounts of time (for repeatability) - then filter off the material (e.g., grated endive). As long as the solvents are edible you should not have any issues. You may find that a water extraction is useless, for example, but that alcohol pulls out interesting flavors. You can also play with techniques to prepare the material. You could chop the endive with a knife or shred with a microplane grater.
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@DiscoverChoc