For dipping sauce, combine tomato, daikon, shiso, green onions, lemon juice, 2 tablespoons of the tamari, the cumin, and chili powder.
Chill overnight. In a bowl, combine rice, tofu, mushrooms, basil, olives, chili pepper, sesame oil, and the remaining 2 tablespoons tamari.
Chill for 30 minutes.
Put 1 tablespoon of filling in the center of each wrapper. Dampen edges with water, fold wrapper in half, and seal edges. In a non-stick skillet, heat a little oil.
Arrange filled pot stickers in a single layer in the skillet; cook over medium heat until the bottoms of the pot stickers are browned.
Add 1/4 cup water; cover and cook on low heat for 6 minutes, or until water is evaporated. Repeat until all pot stickers are cooked. Serve with dipping sauce.
Makes about 24 pot stickers.