Shawarma Keves (שווארמה כבש) is lamb shawarma, the richer and more traditional Middle Eastern register of the spit sandwich, and it hinges on fat. Lamb carries enough of its own that the stack bastes itself as it turns, which is the source of the depth here, but it also means a heavier sandwich that needs sharper, brighter dressing to keep from going one-note. Get the balance right and lamb shawarma reads deep, gamey, and crisp-edged with acid cutting through it; get it wrong and it is greasy, muttony, and flat.
The build leans on the meat. Lamb is sliced thin, marinated with cumin, allspice, and often cinnamon and garlic, then stacked on the vertical rotisserie with its own fat layered through the column. As it rotates against the fire the rendering fat runs down and bastes the meat below, building the crisp, dark outer face that a counter operator shaves to order in thin ribbons. The bread is fresh pita or laffa, sometimes brushed with the dripping fat from the spit, which deepens it further. The dressing has to work against the richness: a sharp tahini, finely cut Israeli salad with plenty of lemon, pickles and sumac onions for acid, amba or s'chug for heat. Done right, the lamb is juicy with crackling edges, the spice and gaminess come through clearly, and the acid keeps each bite from sitting heavy. Done wrong, the meat is fatty and slack from under-rendering, the muttony note dominates with nothing to cut it, or the bread is sodden with grease.
It varies first by the cut and fat ratio, a leaner shoulder-forward stack reading cleaner, a fattier one richer and more assertive, the spice blend shifting warm or sharp with the kitchen. It varies second by the dressing and bread, a tahini-heavy laffa softening the lamb, a tightly packed pita with sharp pickles and amba pushing the contrast harder. Mixed lamb-and-turkey stacks, plate-served formats, and the hummus-based version sit in adjacent territory as recognizable forms of their own and deserve their own treatment rather than a footnote here. They all return to the same idea: a fatty, well-spiced meat roasted on a turning spit, shaved crisp, and dressed with enough acid and heat to frame the richness rather than be swallowed by it.