The best replacement for rouille is aioli.

The best alternatives to rouille are rated as following:
★★★★★  aioli

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Speaking about rouille, one probably shouldn't forget about bouillabaisse.

Other search terms related to rouille and their ratings are:
★★★★★ bouillabaisse
★★★★★ fish soup
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Google Trends

Scale is based on the average worldwide traffic of rouille in all years. Click on graph for more.
rouille
aioli