Special equipment: frilly toothpicks
Fill a saucepan halfway with water and place over high heat. Bring to a boil and salt the water liberally. Add the rigatoni and cook 9 to 11 minutes, until al dente. Drain, rinse well under cold water and set aside.
Cut the block of cheese into 1/2-inch slices and cut each slice into 4 equal pieces lengthwise. Cut each piece in half. You should have 40 pieces. Slide 1 piece of the cheese into each rigatoni (the size should be near perfect.)
Pour the bread crumbs, Parmesan, and parsley into a small bowl and mix well. Working in small batches, put the stuffed rigatoni into the egg wash first, then roll in the bread crumb mixture. Place in a sealable container (they can be stacked on top of each other). Place in the freezer for at least 2 hours and up to 2 weeks.
Preheat the oven to 200 degrees F.
Pour the vegetable oil into a medium saucepan and place over medium heat for 5 minutes. Test by dropping a cube of bread into the oil; if it turns golden within 1 minute the oil is ready.
Working in batches of 6 to 8 and using a slotted spoon, carefully drop the rigatoni into the oil. Fry for 1 1/2 to 2 minutes, until the bread crumbs are a golden brown. Remove to a paper towel lined plate. Repeat until all of the rigatoni have been fried. Keep warm in the preheated oven.
To serve, skewer 1 piece of the mac and cheese and a cherry tomato half with a frilly toothpick. Serve while still warm.
Since these are time consuming and since they freeze well, it's worth making a larger batch than needed and storing them.