Grilled Fish with Avocado Butter

Name: Grilled Fish with Avocado Butter
Ingredients: 1/2 avocado (peeled and mashed until smooth); 1 to 2 tablespoons butter; 1 tablespoon fresh lemon juice; 1/2 teaspoon MAGGI Seasoning Sauce; 1/8 teaspoon garlic powder; 1/4 cup thinly sliced green onions (tops included); 1/4 cup Soy Sauce; 1/4 cup canola or olive oil; 2 tablespoons fresh lemon juice; 1 teaspoon grated lemon peel; 1 clove garlic (crushed); 2 teaspoons Dijon mustard; 4 about 1 1/2 pounds total small swordfish, whitefish or tuna steaks