Single cream

Use equal weight, whisked with a small knob of unsalted butter. Simmer gently over low heat to reduce curdling; sauce will be slightly lighter.

Use 50% weight combined with 50% whole milk, whisked until smooth. Adds intense richness, so stir in at the very end off the heat.

Use 60% cashew paste mixed with 40% warm water. Creates a silky, luxurious thickening that won't split even under high heat.