Heat 1 tablespoon extra-virgin olive oil in a small non-stick sauté pan over medium-high heat and add ¼ diced red onion. Sweat them until slightly soft and just starting to brown approximately 1 minute.
Add the sausage meat, breaking it up into small pieces as it browns. Once it has a good color, add 1 handful kale and sauté until soft.
Add 3 beaten large eggs and give the pan a good mix with a spatula before you let them settle and firm.
Reduce heat to medium and add a lid to the pan to help cook the eggs through evenly.
After about a minute, when the omelette is mostly firm, remove the lid and add 2 ounces of cheese over top. Place the lid back on for another 30 seconds or until the cheese starts to melt.
Slide your omelette gently onto a plate, making sure to fold it over in the middle so the cheese is inside.
Season with Maldon salt and black pepper, garnish with 1 diced tomato.
Serve warm with salad, fresh bread, good butter, and jam!