Combine vinegar, honey, white miso paste, soy sauce, sugar, salt, and pepper in a blender; blend until smooth. Add canola oil and sesame oil; blend until dressing is emulsified and thick.
Pour dressing into a large bowl; stir in green onions. Add spinach and toss to coat.
Transfer spinach to a serving plate. Arrange shrimp on top. Sprinkle sesame seeds over shrimp.
