Have 6 ramekins ready, about 9 cm in diameter.
To make the crust, combine crackers or cookies and oil in a food processor.
Process until coarsely cround.
Divide between the ramekins and press firmly into the bottom.
To make the filling, combine lemon juice, water, 4 tablespoons of oat cream and agar agar in a small saucepan.
Combine the remaining 2 tablespoons of cream with the cornstarch and stir until dissolved.
Bring the lemon mixture to a boil and cook for 1 minute.
Add starch mixture and cook for another minute.
Pour into the ramekins.
To make the topping, place the spread in a small heat resistant bowl and melt over a water bath.
Pour over the filling and place the ramekins in the fridge, until the tartelettes have set.
Remove from fridge about 1 hour before serving.