In a small bowl, mix aioli ingredients together. Set aside.

Cut bread into four even sections and slice those in half from end to end.

Spread aioli on both sides of bread and assemble sandwiches with meat, cheese, and optional tomato.

Give each sandwich a little press with the palm of your hands to flatten slightly.

Heat a large skillet over medium heat for a minute or two, so it has time to heat fully.

While skillet is heating, butter the bottoms of two of the sandwiches and place into the hot pan.

Place a heavy piece of cookware over the panini (cast iron works great for thiand press down firmly. Allow to cook for 1 to 2 minutes until golden and crunchy.

Butter the tops of the panini and flip. Set cookware back on top, pressing down to flatten further. Cook for a minute or so and remove from heat.

Repeat with the other two panini. Slice diagonally if desired. Enjoy!