Ingredients with Measurements:
- 2 oz tequila
- 1 oz lime juice
- 1 oz lemon juice
- 1 oz simple syrup
- 1 egg white
- Ice
- Salt for rim (optional)
- Lime wedge for garnish (optional)

Special equipment needed:
- Cocktail shaker
- Strainer

Step-by-step instructions:
1. Rim a chilled glass with salt (optional).
2. In a cocktail shaker, combine tequila, lime juice, lemon juice, simple syrup, and egg white.
3. Add ice to the shaker and shake vigorously for about 10 seconds.
4. Strain the mixture into the prepared glass.
5. Garnish with a lime wedge (optional).

Preparation time: 5 minutes
Cooking time: 0 minutes
Serve chilled.
Serving size:
1 serving

Nutritional information:
Calories: 200
Fat: 0g
Carbohydrates: 16g
Protein: 3g

Substitutions for ingredients:
- Mezcal or vodka can be used instead of tequila.
- Agave nectar can be used instead of simple syrup.
- Lemon-lime soda can be used instead of lemon juice.

- Add a splash of orange juice for a citrus twist.
- Use grapefruit juice instead of lemon juice for a tangy flavor.
- Add a dash of hot sauce for a spicy kick.

Tips and tricks:
- Use fresh lime and lemon juice for the best flavor.
- Shake the cocktail vigorously to create a frothy texture.
- Use pasteurized egg whites to avoid any health risks.

Storage instructions:
This cocktail is best served fresh and should not be stored.

Reheating instructions:

Presentation ideas:
Serve in a chilled glass with a salt rim and a lime wedge garnish.

- Lime wedge
- Salt rim

- Chips and guacamole
- Spicy shrimp cocktail
- Grilled chicken skewers

Suggested side dishes:
- Mexican rice
- Refried beans
- Grilled corn on the cob

Troubleshooting advice:
- If the cocktail is too sour, add more simple syrup.
- If the cocktail is too sweet, add more lime juice.
- If the cocktail is not frothy enough, shake it longer.

Food safety advice:
- Use pasteurized egg whites to avoid any health risks.
- Make sure to wash your hands and any utensils used in the preparation of the cocktail.

Food history:
The Margarita Sour is a twist on the classic Margarita cocktail, which is believed to have originated in Mexico in the 1930s.

Flavor profiles:
Tangy, sweet, and sour.

Serving suggestions:
Serve as a refreshing cocktail at a summer party or as a happy hour drink.

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Taste: Tangy, Sour, Citrusy, Salty, Refreshing