Hi Dajoca,
Yes, you would think that two dishes with similar ingredients would turn out pretty much the same wouldn't you? However, the length of cooking each component receives, the size of each component, the quantity of each component will all make subtle differences to the end result.
A pinch of sugar here or a sprinkle of salt there, again help determine the end result.
Here is a little experiment to prove the point;
Take;
Half a tomato
half an onion
1 clove of garlic
1 cm x 1 cm of fresh ginger
1 tbsp of oil
Finely chop the tomatoes and onions
crush the garlic and ginger to a pulp and mix together
next. heat the oil and fry all of the ingredients on medium heat for 5 minutes.
Now, with the same ingredient;
slice the tomato and onion
slice the garlic and Julienne the ginger,
Heat the oil on high and when very hot, add all the ingredients and fry hard for 3 minutes.
Same ingredients but the outcome of each will be very different!
I hope that kind of explains what I mean?

All the best,
Ray
