In a food processor or high-speed blender, puree 1 cup of the mango cubes and honey until completely smooth.
In a small saucepan, combine the mango puree, coconut milk, and agar agar powder. Whisk to combine and bring the mixture to a boil over medium-high heat. Once boiling, reduce the heat to medium and continue to boil for 2-3 minutes, whisking often.
Divide the mixture between 6 ramekins or small serving glasses. Transfer to the refrigerator for 2 hours, or until chilled.
Before serving, top with the remaining fresh mango cubes.