- 2 lb (907 g) starchy potatoes, peeled and finely grated - 1 medium onion, about 4 oz (115 g), finely grated - 1 large egg, beaten - 3 tbsp (45 ml) all-purpose flour - 1 tsp (5 g) salt - 1/2 tsp (2 g) ground black pepper - 2 tbsp (30 ml) chopped fresh parsley (about 8–10 g) - 1/4 tsp (1 g) baking powder (optional, for lighter texture) - 1/2 cup (120 ml) vegetable oil for shallow frying, plus more as needed - Sour cream or applesauce for serving (optional)
1. After grating the potatoes, place them in a clean kitchen towel or fine sieve and squeeze out as much liquid as possible; reserve the drained liquid and let it sit briefly so any starch settles, then pour off the clear liquid and stir a spoonful of the settled starch back into the potato mixture to help bind if desired. 2. In a large bowl combine the grated potatoes, grated onion, beaten egg, flour, salt, pepper, parsley, and baking powder if using; mix until evenly combined—mixture should hold together when pressed; if too wet, add up to 1 tbsp (8 g) more flour. 3. Heat a large skillet over medium-high heat and add enough vegetable oil to cover the bottom about 1/8–1/4 inch (3–6 mm). 4. Form the potato mixture into patties about 3–4 in (7–10 cm) wide and 1/2 in (1–1.5 cm) thick; press gently to compact. 5. Fry the patties in batches, without overcrowding, until deep golden-brown and crisp, about 3–4 minutes per side; adjust heat as needed so they cook through without burning. 6. Transfer cooked gromperekichelcher to a paper towel-lined plate to drain and sprinkle lightly with salt. 7. Serve hot with sour cream or applesauce and a simple green salad or steamed vegetables for a traditional Luxembourgish meal.
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