A soft potato-enriched yeast dough rises slowly, gets stretched thin (not rolled), and shallow-fries in hot oil for 60-90 seconds a side until puffed, blistered and golden. Out of the pan, it's brushed with a smashed garlic-water and immediately topped with sour cream and grated cheese. The classic combination is unbeatable, but plain salted lángos eaten with the garlic rub alone is also traditional.
A yeast-leavened, fat-rich dough rests cold so the fat stays solid in flaky layers. The dough is rolled, folded and rolled again like a rough puff pastry, then cut into rounds, scored, brushed with egg and baked at high heat until golden and crisp on the outside, tender inside. Cheese is added by folding grated cheese into the dough and showering more on top.
Eggs hard-boil for 9 minutes, cool fast in iced water, peel cleanly. The yolks get mashed with soft butter, sour cream, Dijon-style mustard and Hungarian sweet paprika to a smooth, glossy paste, seasoned with salt, pepper and a little lemon. Piped or spooned back into the whites; dusted with paprika and finished with chives or parsley.