In a bowl take the flour,salt and carrom seeds and mix it properly.

Add the oil to the flour mix and incorporate it nicely with your fingertips till it resembles breadcrumbs, then add water and knead it to a tight and smooth dough.

Divide the dough into 3 equal parts and add the orange and green food colour each to two parts and knead it properly so that  making it a green and orange coloured dough.
keep all the 3 portions covered for 10-15 mins.

After 10 mins roll out all 3 doughs into 8"ROTI and keep all the 3 colours Roti  on top of each other.

Alternately brushing each roti with water before positioning it on top of the other according to the colours you want in your mathari.

Than roll carefully into a cigar shaped roll brushing a little water at the end and Cut the roll into thin slices like mathari.

Heat the oil for deep fry in a pan and deep fry the dough slices 5-6 together in the pan for 5-6 minutes in medium to low flame till they are cooked properly.

Note:
The Mathris are little soft when out from the oil but turn nice and crispy after they are turn cool.