
A Knish Sandwich is a classic Jewish deli staple featuring a sliced knish—a savory pastry filled with seasoned mashed potatoes and sometimes onions—served on a roll or bread and generously slathered with yellow mustard. The knish itself is baked until golden, offering a flaky exterior and a soft, comforting interior. This hearty sandwich is deeply rooted in Ashkenazi Jewish cuisine and became an iconic street food in New York City.
This dish is primarily high in carbohydrates from the pastry dough and potato filling, with a moderate amount of fat from the baking process and any added oils or butter. It provides a good source of energy, along with some potassium and vitamin C from the potatoes, and typically ranges from 300 to 500 calories per serving depending on size and specific recipe.
| Calories | 680 kcal |
| Protein | 22 g |
| Carbs | 78 g |
| Fat | 32 g |
| Fiber | 5 g |
| Sugar | 4 g |
| Sodium | 1250 mg |
| Potassium | 420 mg |
| Iron | 4.5 mg |
| Calcium | 180 mg |
| Vitamin B1 (Thiamin) | 0.4 mg |
| Vitamin B2 (Riboflavin) | 0.3 mg |
| Niacin (B3) | 5 mg |
| Folate | 120 mcg |
| Phosphorus | 280 mg |
Per 1 sandwich (about 280 g) · estimated, varies by recipe
Culturally, the knish represents the ingenuity of Eastern European Jewish immigrants who transformed humble ingredients into a beloved comfort food. Nutritionally, the pairing with mustard adds a tangy, low-calorie flavor boost that cuts through the richness of the pastry, making it a satisfying yet balanced snack or light meal.