You will need:
Cut the card into strips and place them in the bottom of the tray. Then cover in salt.
Then let your little one write in the salt the words they are learning.
Button really enjoyed this, she was excited to find the colours as she wrote. We tied this in to our Noah's Ark theme.
As she wrote the word I got her to tell me what the word was, so she was getting used to what the word looked like. After she had done all her words I let her just draw in it and play.