Ingredients: 

120gr/4.2oz of white ‘cod fish roe’.
180gr/6.3oz of bread without the crust (around 8 slices of white bread)
1 small onion (around 60gr/2oz), chopped
5 tablespoons of fresh lemon juice
130ml olive oil (1/2 cup)

 

Method

In a bowl filled with water, add the bread and let it soak. Before using it,squeeze out the water with your hands.

Using a food processor or blender, add the onion and turn it into a thick paste. Add the fish roe and blend it with the onion, until the mix is smooth.
Add 1/3 of the bread and blend. 
Pour 1/3 of the olive oil and blend.
Continue adding bread and olive oil in the same manner until you use them all. 
Add half the lemon juice into the processor and blend.
Add the rest of the lemon, blend until emulsified and serve.