01 - Rinse, hull, and halve the fresh strawberries. Arrange them evenly in a rectangular mold or loaf pan (approximately 8 x 4 inches).
02 - In a small saucepan, combine the whole milk, granulated sugar, and powdered agar-agar. Whisk thoroughly until the agar-agar is completely dissolved.
03 - Place the saucepan over medium heat and bring the mixture to a gentle simmer while stirring constantly. Maintain the simmer for 2 minutes to fully activate the gelling properties of the agar-agar.
04 - Remove from heat and stir in the vanilla extract until fully incorporated.
05 - Allow the milk mixture to cool for 2-3 minutes, then gently pour over the arranged strawberries. Tap the mold lightly to release air bubbles and distribute strawberries evenly.
06 - Let cool to room temperature, then refrigerate for at least 3 hours until completely set and firm.
07 - Unmold onto a cutting board and slice into portions. Garnish with fresh mint leaves if desired.