Mix yeast, sugar & warm water together in small bowl (1); let stand ~ 10 min. This mixture will start to bubble.
Meanwhile, in a lg mixing bowl, mix eggs, salt, sugar, oil & 2 c flour together (2). Now is a great time to say, “I am making this dough in the merit of _____ (name someone…maybe a friend who is sick that week, or someone you are happy for, sad for, mad at, etc.)
Add yeast mixture (1) to flour mixture (2).
Add ~ 1½ cups of flour to mixture. Dough should start to form a ball, separating from the bowl.
Place dough on a floured surface & knead, lifting up with one hand & then the other. Knead at least 5 mins as dough becomes increasingly elastic. If still sticky, add a bit more flour to dough. Knead dough into a ball.
Place dough back into oiled bowl, cover & place bowl somewhere warm for 1 – 1½ hours to rise, ~ doubling in volume.
Preheat oven to 375º. Remove cover from bowl, place dough on floured surface. Take a small piece of dough (~size of an egg), double wrap in plastic wrap & say the prayer over separating the challah (technically only say if more than 5 lbs of flour used, but more on that later)*. Discard this piece of wrapped dough & cont.
Punch out dough one more time. Cut dough in half, one for each challah. Then divide each half into 3 equal pcs. Roll out each piece, crimp together at the top and braid into a loaf. Place on a greased cookie sheet. Repeat with second ball of dough. May let rise again at this step.
Paint each challah with a mixture made of egg yolk plus a little water.
Bake ~ 25 – 30 mins, or until bread rises & is golden brown. Remove, cool.
Place challah on platter, cover and wait for Shabbas dinner. Eat and enjoy!
*Baruch Ata A-Do-Nay Elo-haynu Melech Ha-Olam Asher Kidishanu B’Mitzvotav V’Tziyvanu L”Hafrish Challah. (Blessed are You, Lord, our G-d, Ruler of the Universe, Who has sanctified us with Your commandments and commanded us to separate the Challah.)