These sunny shots are guaranteed to get the party going.
Using your fingers and a melon baller, scoop out any remaining flesh and the membranes from each orange half and discard. Divide the orange halves, cut-side up, between two 12-cup muffin pans. In a medium saucepan, bring the orange juice and lemonade to a simmer over medium-low heat. Using a fine-mesh strainer, strain the juice into a medium bowl.
In a small bowl, whisk the sugar and gelatin. Add to the hot juice. Whisk constantly until the sugar and gelatin completely dissolve, 2 to 3 minutes. Stir in the tequila and triple sec. Pour into the orange halves and refrigerate until set, about 4 hours.
Cut each orange half into 3 wedges. Serve with flaky sea salt for dipping.