There are 2 books in the School of Essential Ingredients series. The newest book is The Lost Art of Mixing which came out in 2013.

1
The School of Essential Ingredients

Book cover of The School of Essential Ingredients
From the author of Reese Witherspoon's Book Club pick The Scent Keeper comes a "heartbreakingly delicious" national bestseller about a chef, her students, and the evocative lessons that food teaches about life.

Once a month on a Monday night, eight students gather in Lillian's restaurant for a cooking class. Among…
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2
The Lost Art of Mixing

Book cover of The Lost Art of Mixing
National bestselling author Erica Bauermeister returns to the enchanting world of The School of Essential Ingredients in this luminous sequel.

Lillian and her restaurant have a way of drawing people together. There’s Al, the accountant who finds meaning in numbers and ritual; Chloe, a budding chef who hasn’t learned to…