Dissolve yeast with water and sugar and wait for it to froth. 

Combine flour, water, salt, oil and add to yeast mixture. mix until well combined and smooth. 

Set aside for an hour. 

Place cold pan on stove. 

Spray frying pan with oil spray or use a paper towel dipped in oil to slightly oil the pan. 

Pour ½ cup batter into pan.

Turn on fire to medium-high heat. cook lachuch for 3-4 minutes on medium-high heat. 

Lower heat and cook for 2 more minutes. 

Remove from pan and let rest on paper towels. 

Repeat process with the rest of the batter. if pan gets too hot, remove from heat and run cold water over the bottom of the pan. the temperature of the pan is crucial to the success of lachuch.