Wash the strawberries and core them. Blend them but only for a few seconds.

Boil water, sugar, salt, and agar-agar. Stir continuously.

When it's boiling, add strawberries, then milk. Stir well.

Pour into molds and wait until the jelly is set. I used agar-agar because it can stand the heat and it'll stay firm after hours outside of the fridge.