#include <iostream>
#include <iterator>
#include <string>
#include <algorithm>
 
 
 
 
int main(int, char**) {
 std::vector<char> buffer{std::istream_iterator<char>{std::cin >> std::noskipws}, std::istream_iterator<char>{}};
 auto input = buffer.begin();
 auto const end = buffer.end();
 std::string const start_delimiter{"-Ingredients\n"};
 std::string const end_delimiter{"\n-Preparation"};
 input = std::search(
   input, end,
   start_delimiter.begin(), start_delimiter.end());
 while (input != end) {
  std::advance(input, start_delimiter.size());
  auto stop = std::search(input, end, end_delimiter.begin(), end_delimiter.end());
  // ------ Use --------
  std::string ingredients{input, stop};
  std::cout << "Found:\n" << ingredients << std::endl;
  // -------------------
  std::advance(stop, end_delimiter.size());
  input = std::search(stop, end,
    start_delimiter.begin(), start_delimiter.end());
 }
 return 0;
}

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Blah blah
-Ingredients
A B
and
of course
C
-Preparation
Cook it?

-More blah bla

-Ingredients
- Cool Stuff
- Hot Stuff
Other things
-Preparation
Absolutely no idea