You need the Character Palette
Go to > System Preferences > International
Open International. Click on the Input Menu tab. Tick the box next to Character Palette. Close those preferences boxes.
Now you will see a flag in the top right of the menu bar You can access the character palette from the flag
Fractions are in the Digits section of the character palette, if you have your cursor in the correct part of the recipe, switch to the character palette and double click the fraction you want - it should insert that fraction character in your recipe
You need the Character Palette
Go to > System Preferences > International
Open International. Click on the Input Menu tab. Tick the box next to Character Palette. Close those preferences boxes.
Now you will see a flag in the top right of the menu bar You can access the character palette from the flag
Fractions are in the Digits section of the character palette, if you have your cursor in the correct part of the recipe, switch to the character palette and double click the fraction you want - it should insert that fraction character in your recipe