By "classic", I mean not for your fruity foo-foo friends.  This is for people who actually want to taste the tequila! 

Single Serving:
Ingredients: 

• 1 1/2 ounces Tequila (top shelf, 100% aged agave Tequila)
• 1/2 ounce Cointreau
• 1 ounce lime juice (freshly squeezed - this is important!)
• Dash of agave syrup (to taste)
• Garnish with a lime wedge!

 
Instructions: 

• Fill shaker with ice.  Add all ingredients and shake/mix well. 
• Strain into glass (over ice) and garnish with lime (if desired).

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Nutrition Info Per Serving: 
Calories 163.0
Total Fat 0.0 g
Saturated Fat 0.0 g
Polyunsaturated Fat 0.0 g
Monounsaturated Fat 0.0 g
Cholesterol 0.0 mg
Sodium 1.0 mg
Potassium 80.9 mg
Total Carbohydrate 5.1 g
Dietary Fiber 0.0 g
Sugars 2.6 g
Protein 0.3 g