Preheat the grill to medium. Remove the SPAM from the tube and cut it lengthwise into 4 equal slices. Grill the spam for about 3-4 mins on each side until the outside starts turning crispy. Set aside in a warm place.
Heat the frying pan over medium heat and add in a small knob of butter. Crack eggs into the pan and cook until the whites are set and yolks are done to your likening.
Make the chilli mayonnaise by mixing the mayonnaise with the chilli until combined.
Assemble the sandwiches by starting with the bottom half of the roll, then the chilli mayonnaise, grilled spam, tomatoes, avocado, fried egg, salad green and sandwich rolls top.