In a large saucepan over medium heat, bring broth to a boil. Stir in vinegar, sugar, red pepper and ginger. Add shrimp; cook until shrimp turn pink and curl, 3 to 4 minutes.
Turn off heat; stir in radishes, spinach and green onions. Cover and let stand 2 to 3 minutes before serving. Garnish with enoki mushrooms, if desired.
YIELD: 4 to 6 portions
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