Amounts are per drink, you can make as many as you want at once.
2 oz good vodka (or gin if you prefer),
2 oz pineapple juice,
1 oz lemon juice (not lemonade)
spoonful of grenadine
Pour ingredients into a cocktail shaker full of ice
Shake, shake, shake, then pour through a strainer into a tall glass filled halfway with rocks.
Serve with a lemon garnish