tips for best flavour in sauces:

cooking always with the lowest temperature as possible! so you can keep all the flavour in the sauce and besides you save electricity.

changing temperatures by cooking the sauces optimizes the aroma! for example: several times removing saucepan from stove plate just for any actions like spicing, adding, stirring, etc. (also positiv: the sauce dosen´t splash on the stove/wall)

don´t worry about burning:

 if anything, onion or whatever, burns and sticks to the bottom of saucepan:

add water just as much as the bottom is covered

remove saucepan from stove plate and stir a couple of times, until it is solved!

olive oil:

 how to warm:

turn on stove plate (highest level, ↑6/6) for a short time and put olive oil into saucepan/frying pan

when olive oil gets thin and before there is smell or smoke, then turn on ↓4/6 or ↓2/6, it depends on what you want to cook

how to thicken sauces:

 take a small glass of cold water to prevent lumps!

add the flour (all-purpose flour)

water volume = 3 x flour amount

stir until no lumps remain

then add it under constant stirring to the simmering sauce