For Chickpea Spread: Drop garlic cloves through feed tube of food processor with blade spinning.
Stop processor and scrape down sides.
Add chickpeas, olive oil and lemon juice and pulse until chickpeas are chopped.
Add basil and process, stopping to push down basil and scrape down sides, until mixture is creamy.
Add salt to taste.
For Sandwich: Drain sardines and wrap in a double layer of paper towels to blot dry.
If Sardines are thick, split lengthwise in half.
Toast bagels and spread the bottom halves with chickpea spread.
Arrange sardines, onion slices and lettuce leaves on top of chickpea spread.
Top with bagel halves.
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