South Indian-Style Masala Dosa with Spiced Potato Filling

Directions

1. Soak rice and lentils

   Rinse rice until the water is mostly clear, then cover it with 3 inches of water. In a separate bowl, rinse urad dal and fenugreek, then cover with 3 inches of water. Soak both for 5 to 6 hours.

2. Blend a smooth batter

   Drain, reserving some soaking water. Blend urad dal and fenugreek with about 3/4 cup filtered water until very smooth and aerated. Transfer to a large nonreactive bowl. Blend rice and cooked rice with 1 cup water until smooth with a faint sandy texture. Mix both batters by hand; it should pour in a thick ribbon.

3. Ferment safely

   Cover loosely and ferment in a warm 75–85°F spot for 8 to 12 hours, until visibly risen, bubbly and pleasantly tangy. Discard if it develops pink, orange or fuzzy growth or a rotten odor. Stir in 1 teaspoon salt and enough water to make a pourable pancake-like batter.

4. Cook and crush the potatoes

   Cover potatoes with cool salted water, bring to a simmer and cook 18 to 22 minutes until tender. Drain, cool enough to handle, peel if desired and break into rough 1-inch pieces.

5. Temper the filling

   Heat 3 tablespoons oil in a wide skillet over medium. Add mustard seeds and cover until popping slows. Add cumin and curry leaves for 20 seconds, then onion, ginger and optional serrano. Cook 7 to 9 minutes until soft. Stir in turmeric.

6. Finish the potato masala

   Fold in potatoes, 1/2 cup water and the remaining 3/4 teaspoon salt. Crush about one-third of the potatoes and cook 5 minutes until cohesive but chunky. Stir in lemon and cilantro. Keep warm; offer extra chile separately for a mild family batch.

7. Season the griddle

   Heat a cast-iron or nonstick griddle over medium until a drop of water dances and evaporates. Wipe with a very thin film of oil, then lower the heat briefly; too much oil prevents the batter from spreading.

8. Spread and crisp each dosa

   Pour a scant 1/2 cup batter in the center and immediately spiral outward with the bottom of the ladle into a thin 10- to 12-inch circle. Drizzle 1/2 teaspoon oil around the edge. Cook 2 to 3 minutes until the underside is golden and the surface looks dry; no flip is needed.

9. Fill and serve immediately

   Place about 1/2 cup potato masala in the center, matching the photographed open presentation, or fold the crisp dosa over it. Repeat, cooling and lightly wiping the griddle between dosas if batter stops spreading. Serve at once with optional chutney and sambar.

Why this works

Swaps & notes

Easy swaps

• Use short-grain rice if idli rice is unavailable, though the dosa may be slightly less crisp.
• For a chile-free filling, omit serrano and serve chile chutney only to diners who want heat.
• Sweet potatoes can replace up to half the Yukon Golds for a sweeter, softer filling.

Cook notes

• Total time includes 6 hours soaking, about 12 hours fermenting and 1 hour 40 minutes active preparation and cooking.
• Fermentation speed depends on room temperature; look for visible rise, bubbles and a clean tangy aroma rather than following the clock alone.
• Use filtered water if heavily chlorinated tap water slows fermentation in your kitchen.
• Cool the griddle briefly between dosas if the batter sets before it can be spread.
• The batter is naturally gluten-free, but verify spices, chutney and serving accompaniments if cooking for someone with celiac disease.

Storage

Refrigerate fermented batter and potato filling separately for up to 4 days. Bring batter toward room temperature and thin as needed before cooking; reheat filling to 165°F. Cooked dosas lose crispness quickly and are best fresh. Freeze batter in measured containers for up to 1 month, leaving room for expansion.

Questions