Place the strawberries, 1 cup of water, sugar, and cinnamon stick in a stock pot.
Cook uncovered for 8-9 minutes on medium heat.
Remove from heat and let cool slightly for about 15 minutes.
Discard the cinnamon stick.
Place everything inside a blender. Blend until smooth.
Set aside until ready to use.
Dissolve cornstarch with 1 cup water.
Set aside.
In a stock pot add milk and a pinch of baking soda. Stir occasionally.
Do not let it boil.
As soon as it comes up to a soft simmer, add the strawberry mixture.
Stir to combine.
Add the cornstarch mixture and vanilla.
Don't stop stirring!
It will start to thicken in about 4-5 minutes.
Once it comes to boil, immediately remove from the heat.
Taste for sweetness. Add more sugar if needed.
Cool slightly before serving.
Top with a few extra strawberries for decoration.