Finely chop the onion. Thinly slice the lettuce. Remove the stems from the cherry tomatoes and cut them in half.

In a microwave-safe bowl, mix ground meat, onion, and sauce ingredients. Cover with plastic wrap and microwave at 600W for 3 minutes. Stir, cover again, and let sit for 5 minutes to allow flavors to meld.

Separate the egg yolks from the whites.

Whisk the egg whites until stiff peaks form, adding a pinch of salt and pepper to stabilize the meringue.

On a baking tray lined with aluminum foil and greased with salad oil, divide the meringue into two portions. Create a small indentation in the center of each and place an egg yolk in the middle. Sprinkle with shredded cheese and bake in a toaster oven for 2–3 minutes until lightly browned.