Mix the cornstarch with 2 tablespoons water and set aside.
In a food processor combine nori, shallots, ginger, garlic, chilis, sweet chili sauce, and tomato paste, with enough water to make a paste.
Heat peanut oil in a large saute pan or wok, and cook the paste for 30 seconds to 1 minute.
Add the chopped hearts of palm and artichoke hearts and stir well to combine.
Add broth and boil.
Stir in cornstarch and boil to thicken.
Combine cilantro, jalapeno, and scallions and use as garish