Fill a tall glass with some ice cubes. Add 2 oz silver tequila and 4 oz fresh orange juice.
Now add the grenadine syrup near the edge of the glass. As the density of the grenadine syrup is very high so it will sink to the bottom of the glass and slowly rise up and make the sunrise effect.
Notes
Don't need any specialist to make this drink. The sunrise effect will make naturally if you follow the directions.