Make pizza dough according to instructions or use a pre-purchased pizza crust, if you prefer. Note that, if using the pizza dough at the link, you will need to start several hours earlier or the day before.
Make Red Sauce
In medium saucepan, on medium high heat, crumble and cook ground beef, about 10 minutes. Drain, reserving about 2 tablespoons fat. Remove cooked beef from pan and finely chop. Return to pan.
Add onions, bell pepper, carrot and garlic. Stir. If it's really dry and sticking to pan, add the bit of olive oil. Cook until onions are translucent and fragrant, about 6-7 minutes.
Add tomato paste and 1/4 cup chicken stock. Stir. The sauce needs to be easily spreadable without clumping together in big lumps but not so wet that it will drain off the pizza. Think "ketchup consistency".
Add remaining stock, about a tablespoon at a time until you get the desired consistency. Add seasonings. Reduce to simmer, stirring frequently, and allow to continue cooking while preparing the remainder, about 15 minutes.
Preheat oven to 425°.
Spray pizza pan with cooking spray. Place crust on pan and pinch the edges a little, if you like. This helps to catch the sauce from spilling over.
In small mixing bowl, mix together ricotta cheese, spinach and Parmesan cheese. Evenly spread ricotta mixture on the dough with the back of a spoon or spatula.
Evenly distribute meat sauce over ricotta. Evenly distribute mozzarella cheese over top.
Cook for 15-20 minutes, or until done. Cool slightly and cut into 8 pieces. If desired, garnish with chopped green onion, freshly cracked pepper and red pepper flakes.
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