How to get a two sided cel shader shadow

Development Programming & Scripting Blueprint
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hello,help please i made a cel shader material for palm leafs, but when i use the two sided option i don’t get a shadow on the seconde side as i m using an emissive color

https://scontent-mrs1-1.xx.fbcdn.net/v/t35.0-12/21170974_10211916971577520_776419937_o.jpg?oh=2b4baae55b1c4fabc90d22dbab1d4e52&oe=59A3AF32