Yes, it is possible to cook the gammon a little more tomorrow to ensure it reaches your desired level of doneness. Since you mentioned the power kept tripping out, it's likely that the interrupted cooking process might not have allowed the gammon to cook fully.
Here's what you can do:
Refrigerate the Gammon: If the gammon has been sitting at room temperature for an extended period due to the power outages, it's essential to refrigerate it promptly to prevent any potential food safety issues. Place it in an airtight container or wrap it tightly in plastic wrap or foil before storing it in the refrigerator.
Reheat and Finish Cooking: When you're ready to cook the gammon again, take it out of the refrigerator and bring it to room temperature before reheating. You can reheat it in the oven at a low temperature (around 300°F or 150°C) until it's warmed through.
Use a Meat Thermometer: To ensure the gammon is cooked to the appropriate internal temperature, use a meat thermometer. The internal temperature should reach 145°F (63°C) for safe consumption. If it still needs more cooking, you can continue to cook it until it reaches your desired doneness. Be cautious not to overcook it, as it may dry out.
Glazing: If your original cooking process involved glazing the gammon, you can add the glaze during the reheating process to enhance the flavors.
Slice and Serve: Once the gammon is fully cooked and has reached your preferred level of doneness, let it rest for a few minutes before slicing and serving.
By reheating and finishing the cooking process the next day, you can ensure the gammon is safe to eat and achieve the desired texture and flavor. Just make sure to follow proper food safety practices and use a meat thermometer to monitor the internal temperature for safe consumption.