In a wide pan,boil water, add salt and oil. Then slowly add the pasta and cook till the pasta is al dente.( it should be soft but firm)
Stir in between to prevent the pasta from sticking together.
After it is cooked, drain it in a colander and pour cold water on it.
Heat oil in a pan, sauté garlic for a few seconds, then add capsicum, carrots and cook uncovered till done.
Do not overcook the vegetables should retain the crunchiness.
Add mayonnaise, cream, tomato ketchup, cheese, oregano, salt and pepper powder.
Now mix the pasta in veggie-sauce mixture and sprinkle some oregano, if it is too thick , you can add little milk.
Now do the plating according to your choice sprinkle oregano and serve hot.
Here I have tried to depict the tricoloured plating.