Mix the Dry
In a large mixing bowl, whisk together the flour(s), lemon zest, ground cardamom, coriander, nutmeg, and salt.
Form the Dough
Drizzle the 3 tbsp (45 ml) of melted ghee or oil over the flour mixture. Use your fingertips to rub it in until it resembles coarse crumbs.
Add the puréed banana and 0. 25 cup (6000 ml) of warm water.
Mix everything together to form a shaggy mass.
Add more warm water, just a tiny splash at a time, until you can form a stiff, kneadable dough. Be careful not to add too much water.
Knead and Rest
Turn the dough out onto a clean work surface. Lightly oil your hands and knead the dough for about 8 minutes, until it becomes silky smooth and pliable.
Shape the dough into a ball, rub it with a little oil, and place it in the bowl.
Cover with an inverted bowl or a damp cloth and let it rest for at least 30 minutes and up to 3 hours.
Shape the Pooris
After resting, knead the dough briefly. If it has become too soft, knead in a little extra flour.
Divide the dough into 16 equal pieces.
Roll each piece between your palms to form a smooth ball.
Cover the dough balls with a damp cloth to prevent them from drying out.
Take one ball and flatten it into a 2-inch patty. Lightly dip one edge in oil and roll it out into a 5-inch circle of even thickness.
Place on a baking sheet and cover.
Repeat for all remaining dough balls, arranging them in a single layer.
Fry to Perfection
Pour about 3 inches of oil into a wok, karai, or deep pot.
Heat over medium-high heat until it reaches 365°F / 185°C.
Gently slide one poori into the hot oil. It will sink and then quickly float to the surface.
As it rises, use the back of a slotted spoon to gently press it down into the oil. This encourages it to puff up dramatically.
Fry for about 30 seconds until the bottom is golden brown, then flip and fry the other side until golden.
Remove the puffed poori with the slotted spoon, allowing excess oil to drip off, and place it on a tray lined with paper towels.
Repeat with the remaining pooris, ensuring the oil temperature stays consistent.