Serves four to six as an appetizer.
2 scallions, minced
1/4 cup soy sauce
1/4 cup water
2 teaspoons rice vinegar
2 tablespoons honey
1 tablespoon grated ginger root
2 minced garlic cloves
1 teaspoon dry mustard
2 cups all purpose flour
4 teaspoons baking powder
2 cups cold water
1/4 cup dark sesame oil
5 cups seasonal fresh veggies, such as broccoli, zucchini, carrots, sweet potatoes, mushrooms, etc.
For the dipping sauce, combine the scallions, soy sauce, water, vinegar, honey, ginger, garlic, and mustard in a bowl. Cover and refrigerate for an hour to let the flavors blend.
For the batter, mix together the flour and baking powder. Add the cold water and sesame oil all at once and whisk until the consistency of pancake batter and very smooth. Refrigerate until ready to prepare the tempura.
Blot the vegetables dry, season with salt and pepper and dip into the batter. Coat them evenly.
Pour the oil into a tall pot to a depth of 3 inches. Heat over medium heat until around 350 degrees F. Work in batches to avoid crowding. Slip the batter-coated vegetables into the hot oil, deep-frying until the batter is a golden brown and puffy, 3-4 minutes. Turn the veggies so they cook evenly. Remove from the pot with tongs. Drain on an absorbent towel. Serve with dipping sauce.