I'm a fan of
Logee's Greenhouses and heartily second that recommendation. They are a great resource not only for their selection of hard to find plants but also for their knowledge. They've been growing edible exotics at a northern latitude for many years. Everything from dwarf bananas, cocoa and citrus to figs, black pepper, pomegranates, olives and vanilla! Logee's has a good sense of what varieties will work in most situations for most people. I often check their website and videos for insight when I have a question about growing something in the category of exotic edibles. Currently I have figs, kumquat, turmeric, yellow, ginger and galangal ginger.
Citrus is a challenge, but I do enjoy it. They require some extra attention with fertilizer because trace mineral deficiencies can happen easily (in my experience). I've made several attempts over the years and have learned a bunch each time. I did manage to pick an orange that I grew, so I know it is totally possible. Plus the flowers smell amazing, that alone is worth it! For my third attempt with citrus, I've decided to focus on kumquats, because I enjoy their tartness, but also because I suspect smaller fruit will be more achievable to ripen in the home environment (I don't have a greenhouse, just a south window). Other influencing factors in my choice of kumquat is their natural lack of thorns and plant hardiness. Some kumquat varieties can be hardier than other citrus, tolerating cooler temperatures, which allows me to keep the plant outside a little longer in the fall. If you can give your exotic edibles a "summer vacation" outdoors, they will love it. That being said, the plant is handled a fair amount with schlepping it in and out, spring and fall. I'd rather not have thorny branches in my face when I awkwardly carry a 4' citrus tree in a 14" pot through the doorways. Besides it shares my indoor living space too.
I'm on my second attempt with figs, they seem to be a little easier to maintain than citrus and more forgiving about nutrient needs (at least for me). I'm trying something different with overwintering my figs this time and fingers crossed, I will have fruit this summer! We'll see.
Many of the herbs, especially the Mediterranean herbs will do surprisingly well indoors in a sunny window. Over the years I've had good luck with keeping rosemary, lavender, spearmint, oregano and thyme in pots through the winter months in a south or west facing window. They made beautiful edible and fragrant houseplants.
Turmeric, ginger and galangal was mentioned earlier and I totally agree with this suggestion! They are worth considering. Galangal especially because it prefers indirect light and grows happily for me at a distance away from the south window. I currently have
Alpinia officinarum which is known as lesser galangal. It's foliage has an interesting cinnamon-like fragrance and the roots have medicinal properties. This is still a new herb to me and I have not tried the roots just yet. But I've found the plant to be super easy to grow! I divided it last spring and will have enough to try harvesting this year. I've read that the young shoots of greater galangal
Alpinia galanga are edible and found in Thai cuisine. This galangal also interests me too, but it grows much larger (I think I read 6 feet somewhere). The lesser galangal has stayed under 3 feet for me and I think
Alpinia officinarum makes a really great houseplant with potential usefulness.
Last but not least, I must mention turmeric. This has been a favorite of mine to grow in pots for many years. I harvest roots ever other year or so. They do need extra time to mature beyond what a zone 4 growing season will allow. I most enjoy nibbling on the flowers when turmeric blooms. The plant is gorgeous for achieving that indoor tropical oasis look and it can grow quite large (about 4 feet or so). It will die back and go dormant during the winter months, but I find this to be one of it's charms and makes it easy to care for. Dormancy lightens the watering schedule rather nicely and I can set the pot off to the side, in less ideal light until spring. Turmeric resprouts readily as the day length increases or about the time I'm ready to schlep my potted tropicals outside. The same has been true for yellow ginger, although I've found yellow ginger to be much more slow growing for me.
And don't forget good ol'
Aloe vera, another super easy and useful houseplant for the south window.
I totally get the allure of growing your own tropical edibles. Obviously, this is a topic I can carry on enthusiastically about! Don't be afraid to try things or even try the same thing again. There is a lot to learn with tropical container garden culture and what works for you, might be different from what works for me. Good luck in your edible houseplant adventures!