Steps
1. In a small saucepan, combine cold water and agar-agar powder. Let it soak for 5 minutes.
2. Heat the mixture over medium heat until it boils, stirring frequently to dissolve agar completely.
3. In a mixing bowl, combine orange juice, orange zest, honey, vanilla extract, and a pinch of salt.
4. Gradually pour the hot agar mixture into the orange mixture while whisking continuously.
5. Using a hand mixer, whip the combined mixture for about 8-10 minutes until it becomes fluffy and light.
6. Pour the fluffy mixture into a small, parchment-lined container and smooth the top.
7. Let it set at room temperature for at least 3 hours or until firm.
8. Cut into small marshmallow squares and enjoy fresh or store in an airtight container.