It's a whole plant family: the nightshades.
Yeah, too bad it's not something super exotic and tremendously expensive,
instead of the useful potato, that way the *deprivation* would seem less.
I'm sensitive to nightshades too. But I can have potatoes, tomatoes, and most peppers, as long as they're fully ripe, or cooked until tender. Eggplants though.. If you want to see my face swell up to look like a baloon... yeah.
But zucchini is very similar to eggplant. One can make zucchini parmesan, just like eggplant parmesan. Mmmmmmm! It's so good. And hummus, with the sesame left out, and when seasoned similarly, tastes just the same, really, as baba ganoosh.
If you're allergic to tomatoes, that's the reason God gave us the far superior alfredo sauce.
Have you ever tried sliced berries on your pizza? I swear. Put raspberries on your pizza. The sweetness and tartness really mimics sun dried tomatoes. Thank me later.
And potatoes... hmmm... I do love fried turnips or rutabegas. You can get really exotic and try sunchokes. i love growing those. Grape Hyacinth bulbs, after the flowers die back, are quite tasty too. Make sure and cook them through, and do not eat the greens though. I've been eating that with my daughter, since she was a baby. Every time we've had a yard, I always plant a little patch of hyacinth.