Combine the orange juice, tequila, and lime juice in a large pitcher.
Stir the mixture well to ensure the tequila is fully incorporated.
Fill each popsicle mold about 3/4 of the way full with the juice mixture.
Leave enough room at the top for the grenadine and for the liquid to expand as it freezes.
Slowly pour 1/4 oz of grenadine into each mold.
Do not stir the molds so the grenadine can sink to the bottom.
Place the lid on your popsicle mold and insert the sticks.
Put the molds in the coldest part of your freezer.
Freeze the popsicles for at least 6 to 8 hours or overnight.
Pull gently on the sticks and serve immediately.