There are brunch staples—and then there are brunch icons. The smoked salmon and avocado tartine falls firmly into the latter ...

Put the avocado into a food processor with the lime juice, spring onions, cream cheese and cayenne ... When you are ready to serve, divide the smoked salmon between the plates, then add a spoonful ...

Season with salt to taste and set aside. Make avocado crema: Slice remaining scallions and add to blender with mayonnaise, sour cream, peeled avocado, remaining cilantro, jalapeño and garlic.