Sea buckthorn jam (or jelly) is a tasty tropical spread that you can grow in the north country. Seaberries have a flavor that’s a cross between orange and pineapple, but they’re a hardy northern fruit that can tolerate temperatures as low as -50 F (-45 C)! Preserving these tasty tropical jewels is one of the best ways to taste the tropics year-round, even if you’re buried in snow.