Rinse cucumber, tomatoes and herbs under running water, then dry them thoroughly so surface water does not enter the salad.
Dice cucumber into 1/2-inch pieces, halve or quarter tomatoes and finely chop red onion and herbs.
Toss cucumber, tomatoes, onion and herbs with olive oil, lemon juice, oregano and black pepper. Do not add salt yet.
Add cottage cheese and fold gently with a flexible spatula until evenly distributed, keeping the curds distinct.
Add salt a pinch at a time only if needed. Adjust with lemon or olive oil and serve immediately or chill no more than 15 minutes.