Here are several refined versions of your sentence, with different tones:
Warm & Poetic
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Keep this recipe close—it’s truly a little treasure on earth.
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Hold on to this recipe; it’s a rare treasure worth keeping.
Friendly & Inviting
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Save this recipe—you’ll treasure it forever.
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Don’t lose this recipe; it’s pure gold in the kitchen.
Simple & Clean
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Keep this recipe—it’s a real treasure.
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This recipe is a treasure worth saving.
More Expressive
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Guard this recipe carefully—it’s a true culinary treasure.
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This recipe is like a hidden treasure you’ll be glad you found.
If you’d like it to sound more emotional, more casual, or more elegant, tell me the vibe and where you’ll use it (video, blog, recipe card, or social post).