Heat cooking oil in wok or large, wide saute pan over medium high heat. When oil is hot, add eggs and gently stir to cook eggs. When eggs are about 80% done (still a little runny), remove from pan and set aside.
Turn heat to high. Add a little more cooking oil to pan. When hot, add diced Spam to the pan. Cook until spam is browned. Add green onions, fry until fragrant. Add spinach, fry until softened. Add rice and the cooked eggs and toss to incorporate all ingredients throughout rice.
Let it all just sit still in the pan so that the grains of rice have a chance to heat up, about 1 minute. Toss so that the rice that is on the top now is on the bottom. Add cooking wine and fish sauce and stir again. Season with ground pepper. Is every grain of rice hot? If not, cook longer.
Taste...salty enough? If not, add a little more fish sauce. But since the spam is salty already, you might want to go light on the fish sauce.