Preheat oven to 375 degrees F. Grease 9x13, and set aside
Whisk together eggs, milk, salt and oregano, pour mixture into the pan
Spoon dollops of ricotta into the egg mixture, and then evenly place tomatoes in-between the ricotta
Bake for 35-40 minutes, until tomatoes have begun to blister, and the eggs are set
Remove from the oven, season with salt and pepper to taste, lemon zest, allow to cool slightly before serving (5 or so minutes