Stuffed Catfish topped with Garlic Butter and Grilled Asparagus Spears and Sweet Potatoes

Name: Stuffed Catfish topped with Garlic Butter and Grilled Asparagus Spears and Sweet Potatoes
Ingredients: 1 red onion, diced; 2 cloves garlic, chopped; Olive oil, for sauteing; 1/2 cup breadcrumbs; 2 tablespoons capers; 4 catfish fillets; Garlic Butter Sauce, recipe follows; Grilled Asparagus Spears, recipe follows; Sweet Potatoes, recipe follows; 4 tablespoons butter; 1 lemon, juiced; 2 cloves garlic, minced; 6 ounces dark wheat beer; 1 cup chicken stock; Salt and freshly ground pepper; 10 to 12 asparagus spears, trimmed; Vegetable oil, for sauteing; 2 sweet potatoes, scrubbed; Vegetable oil, for grilling; Salt and freshly ground black pepper