1.Boil one cup of hot water in a saucepan, then add in Jell-o powder and whisk until powder is completely dissolved, about 2 minutes. Set aside. Measure out 1/4 cup of cold water and set aside.
2.Combine tequila and Cointreau, in cocktail shaker filled with ice. Add liquour mixture to cold water and stir to combine. Then add cold liquour mixture to hot Jell-o mixture and stir to combine.
3.Pour final Jell-o mix into strawberries (limes/lemons) and chill overnight. Dip your finger in water or use a moistened brush to wet the edge of the strawberries, dip and rotate the strawberries in salt to rim. Garnish with cut lime triangles to finish.