G: You’re basically building a Dark & Stormy variant with pineapple—so think in terms of balance: rum = backbone, ginger beer = bite, pineapple = softener.

Core Ratio (clean, repeatable)

• 2 oz dark rum
• 3 oz ginger beer
• 1 oz pineapple juice

This keeps:

• ginger bite dominant
• rum clearly present
• pineapple noticeable but not turning it into juice

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Adjustment Logic (use this instead of guessing)

If it tastes too sweet:

• Drop pineapple to 0.5 oz
• Or increase ginger beer to 4 oz

If it’s too sharp/spicy:

• Increase pineapple to 1.5 oz
• Or reduce ginger beer slightly

If the rum disappears:

• Go up to 2.5 oz rum
• Or reduce ginger beer by ~0.5 oz

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Build Method (matters more than people think)

• Fill glass with ice
• Add pineapple juice first, then rum
• Top with ginger beer last (keeps carbonation intact)
• Light stir or none if you want layered effect

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Optional (but actually useful tweaks)

• Lime squeeze (0.25–0.5 oz) → sharpens everything, cuts sweetness
• Angostura bitters (1–2 dashes) → adds depth, makes it feel intentional instead of “mixed”

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Third Option (if you want it tighter)

If you want something less “drinky” and more controlled:

• 2 oz rum
• 2 oz ginger beer
• 0.75 oz pineapple
• 0.5 oz lime

That version drinks more like a cocktail than a highball—cleaner edges, less drift.

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Bottom line:
Start 2 : 3 : 1 (rum : ginger beer : pineapple) and adjust from there depending on whether you want bite, smoothness, or punch.