Sabich Im Tapuach Adama (סביח עם תפוח אדמה) is sabich built with potato added: the standard fried eggplant, hard-boiled egg, Israeli salad, tahini, and amba in pita, with boiled or fried potato slices worked in. The angle is added ballast. A classic sabich is a soft, wet, layered pocket without much starch, so the potato changes its weight and texture, giving the sandwich a denser, more filling backbone that absorbs the amba and tahini and steadies the whole thing.
The build keeps every classic component and adds one. The eggplant is sliced thick and fried until deeply soft and bronzed, the egg is hard-boiled and sliced, the Israeli salad is finely diced, tahini is loosened, and amba goes in as standard. The potato comes in two common forms: boiled slices that stay tender and soak up the sauces, or shallow-fried slices with a crisp edge that hold their shape and add contrast. Done right, the potato gives substance and mops up the amba and tahini so nothing pools at the bottom, the eggplant stays silky beside it, and the salad and pickles still cut through the heavier base. Done wrong, the potato is bland and underseasoned so it dulls the whole sandwich, the boiled slices turn to a heavy paste that smothers the eggplant, or fried slices go in cold and greasy and drag the layering down.
It is served as a stuffed pita, eaten by hand, with pickles and lemon to keep it from going leaden. It varies first by how the potato is cooked, boiled slices leaning soft and absorbent, fried slices leaning crisp and distinct, sometimes a spiced or sumac-dusted potato leaning more seasoned, and second by the heat and extras, more s'chug or amba leaning sharp against the starch, doubled eggplant or egg leaning fuller still. The fully loaded and spicy builds sit in adjacent territory as orders of their own. Each deserves its own treatment rather than a line here, but they all return to the same idea: the classic sabich given a starchy backbone, the eggplant and egg still the heart with the potato adding weight rather than taking over.