Few things make our hearts flutter quite like an oozing string of cheese.

The humble cheese toastie (or grilled cheese as it's commonly known in America) is a comfort food and guilty pleasure like no other.

But how do you nail that perfect combination of creamy filling and crispy bread? We asked Nisha Patel and Nishma Chauhan of London street food stall Grill My Cheese to share their insider tips.

Before launching their business, they travelled the United States, starting in San Francisco and moving onto Los Angeles, Austin, New Orleans and New York to learn the tricks of the trade and the art of crafting the perfect cheese toastie. They discovered their favourite melts at Mission Cheese in San Francisco and Melt Ship in New York.

Based on these findings, here is their fail-safe recipe.

Step 1: Combine multiple cheeses

“We always recommend combining a few cheeses to get a great flavour, melt and stretch. A sharp cheddar, with a buttery gruyere is a winner for us. But even a slick of cream cheese underneath it all can be a delight.”

“Avoid really hard cheeses that struggle to melt. Halloumi and cottage cheese are big no-nos.”

Buttery gruyere and golden crust: how to make the ultimate grilled cheese toastie (from the most talked-about street food stall in town)