Step 1

Preheat oven to 400°

Step 2

In a skillet heat oil and cook leeks for 8-10 minutes, until sweating and cooked down- remove and set aside.

Step 3

Using a mandoline knife, slice potatoes or sweet potatoes thin (1/8 inch thick). Transfer to a bowl and toss with olive oil, salt and pepper

Step 4

Roughly chop tomatoes and place in a small saucepan. Heat for 5 minutes. Remove from heat, season with salt and pepper.

Step 5

In a cast-iron pan, or other oven safe skillet, begin layering. 1/3 of the potato slices, in a circle until cover. Top with leeks, then spread a 1/3 of the tomato mixture. Repeat 2 additional times.

Step 6

Add 1/2 of the optional Parmesan cheese and sprinkle the paprika on top, bake for 35 minutes.

Step 7

Add remaining cheese and bake for an additional 10-15 minutes, or until cheese is bubbling and top is golden.