Springtime Soba With Miso Sauce

Ingredients

• 4 ounces medium tofu
• 2 tablespoons cornstarch
• 3 tablespoons coconut oil or vegetable oil
• 2 tablespoons salt
• 4 ounces asparagus, trimmed and cut into 2-inch pieces
• 4 ounces soba (plain, green tea, or mugwort flavored)
• 1 tablespoon butter, melted
• 2 teaspoons white miso
• 1 teaspoon lemon juice
• 2 tablespoons chopped chives
• 2 ounces watercress (about 2 cups), tough stems removed
• 2 small radishes, thinly sliced
• toasted sesame seeds (black or white), for garnish