Step 1

Preheat oven to 200°C (375°F).

Step 2

Using a medium or large cast-iron skillet, heat 1 & 1/2 tbsp of olive oil, over medium-high heat.

Step 3

Add garlic and onion.  Cook until onion has slightly softened.

Step 4

Add tomato sauce, salt, pepper, sugar, fennel seeds, and parsley.

Step 5

Mix to combine and cover with a lid.  Bring to boil, lower heat to medium-low and simmer for 10 minutes.

Step 6

Place the slices of tomatoes on top.  Season with salt, pepper, and dried oregano.  Drizzle with the remaining olive oil.

Step 7

Place in the oven for 40 to 45 minutes, or until the tomatoes on top have slightly dried up.

Step 8

Remove the skillet from the oven and serve directly.