In a 1 gallon plastic ziplock bag, add the yeast, water, sugar, salt, oil and 3 cups of flour. Give the bag a little shake. Don't work too hard- remember, it's a lazy challah! Place the bag in a bowl of warm water for 30 mins. Remove from bowl, shake, release air from bag, and place on the table for 1 hour. Flip bag every 20 mins. The dough should be very wet. It will start to bubble and self-knead. WHOA. After the 1 hour, add ¼ cup flour and give the bag another shake. This makes the dough not stick to the bag. Leave the bag for 1 hour and 30 mins to rise. It should still be a wet dough. If it's not rising, flip it over and knock it down. If the dough is wet, the recipe will turn out amazing. Preheat oven to 300℉/150°C. On a well-floured surface, separate the dough and stretch out 3 strands. Braid. Baste with egg and sprinkle sesame seeds (optional for vegan challah, substitute olive oil). Leave to rise for 15 mins before it goes in the oven. Bake on a non stick tray for 40 mins or until golden on top.