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In a medium saucepan, heat milk and cream over medium-low until steaming but not boiling.
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In a separate bowl, whisk egg yolks and sugar until pale and creamy.
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Slowly temper the eggs by whisking in a ladleful of hot milk mixture. Continue until half the milk is incorporated.
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Pour the egg mixture back into the saucepan, whisking constantly.
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Cook gently until the custard thickens enough to coat the back of a spoon (about 170°F / 77°C).
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Remove from heat, stir in vanilla extract and a pinch of salt.
Step 2: Make the Banana Puree
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Peel bananas and place them in a blender.
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Add lemon juice (prevents browning) and condensed milk.
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Blend until smooth and creamy.