In a bowl, stir together water, ketchup, soy sauce, cornstarch, honey, crushed red pepper, and ground ginger. Set aside.
Heat oil in a large skillet over medium-high heat. Stir in green onions and garlic; cook 30 seconds. Stir in shrimp, and toss to coat with oil. Stir in sauce. Cook and stir until sauce is bubbly and thickened.
In a large bowl, combine the Roma tomatoes, sun-dried tomatoes, garlic, olive oil, vinegar, basil, salt, and pepper. Allow the mixture to sit for 10 minutes.
Cut the baguette into 3/4-inch slices. On a baking sheet, arrange the baguette slices in a single layer. Broil for 1 to 2 minutes, until slightly brown.
Divide the tomato mixture evenly over the baguette slices. Top the slices with mozzarella cheese.
Broil for 5 minutes, or until the cheese is melted.