Final answer:
The amount of hot water needed for grilled mushrooms and onions isn't typically specified in recipes. Instead, use the liquid from an 8-ounce can of mushrooms as indicated in the ingredients. This liquid should be combined with the other ingredients including parsley, salt, flour, and almonds for the dish.
Step-by-step explanation:
In the preparation of grilled mushrooms and onions, the specific amount of hot water to be used isn't typically specified because it varies based on the cooking method and recipe. However, if we refer to the ingredients provided, it states '1 (8 ounce) can mushrooms and liquid', which suggests that you should use the liquid from the can of mushrooms as part of the recipe. In most cases, you would drain the mushrooms and preserve the liquid for use in your cooking. The liquid that accompanies canned mushrooms is usually a mixture of water and salt, which adds flavor to the dish. This liquid should be measured according to the recipe's instructions or to personal taste.
For the recipe at hand, you would use the entire contents of the can, both mushrooms and the liquid they are preserved in, without the need to add any separate hot water. When preparing the dish, ensure to mix the ingredients thoroughly, including the parsley, salt, flour, almonds, and seasoning, to create a cohesive mixture.
The final seasoning of the dish with salt and pepper should be done to taste, taking into consideration that the canned mushrooms' liquid already contains salt. It's therefore advisable to taste the dish before adding any additional salt.