Based on the text you provided, here’s a recipe for cooking silverside (which is another term for corned beef) in foil:
Ingredients:
1 pound corned beef (silverside)
Olive oil
Salt
Black pepper
Instructions:
Preheat your oven to 350 degrees Fahrenheit (175 degrees Celsius).
Pat the corned beef dry with a paper towel.
Wrap the corned beef tightly in aluminum foil.
Place two egg rings in a slow cooker (SC).
Pour a little water into the bottom of the slow cooker, just up to the top of the egg rings.
Rest the foil-wrapped corned beef on top of the egg rings.
Cook on low for 8 hours.
The image you sent appears to show sliced corned beef on a cutting board, however, there is not foil in the image.
Here are some tips for cooking corned beef in foil:
You can add some vegetables to the slow cooker along with the corned beef, such as carrots, potatoes, and onions.
If you don’t have egg rings, you can use another trivet to elevate the corned beef out of the liquid in the slow cooker.
The internal temperature of the corned beef should be 160 degrees Fahrenheit (71 degrees Celsius) when it is finished cooking.