Pan-fried eggs in sauce is a really versatile technique. I think what tried to say was that any quality of tomato sauce you like will work well to make a good shakshuka, from jarred to freshly made. But you can also use other sauces: green salsa, and pesto eggs are good too. I do like to have some kinda starch ready, if it's saucy. Or just for runny yolks. Pita, tortilla, crusty loaf; whatever's most appreciate