Home cooks present dishes to the judges.

Home cooks present dishes to the judges.

The top 19 contestants face a mystery box challenge; the contestants face elimination.

The cooks must create a healthy meal for over 300 school children.

The cooks must prepare a dish using mystery box ingredients, which include cod; two contestants are sent home.

The cooks prepare a steak meal for firefighters; the challenge losers cook eggs benedict.

Four cooks prepare burger dishes at Gordon Ramsay BurGR in Las Vegas.

A mystery-box challenge involving foreign ingredients takes place; chef Lidia Bastianich judges pasta dishes.

The contestants prepare a meal for the cast and crew of "Glee." Jane Lynch, Cory Monteith and Matthew Morrison serve as judges.

The contestants deal with a mystery-box challenge that involves an unusual ingredient and a limited pantry; Season 3 winner Christine Ha surprises the chefs.

A meal is prepared for a wedding party.

Restaurateur Eva Longoria selects Mexican-inspired ingredients for a mystery box challenge.

The contestants must prepare fish tacos for hungry surfers; in a pressure test, contestants must prepare a perfect chicken breast three different ways.

The nine remaining contestants make sausage link dishes using a sausage maker, with the winner choosing the ingredient to be used in the canned versus fresh challenge.

The cooks compete in an overnight challenge; the losing team faces a spun sugar dessert pressure test.

The cooks create dishes inspired by loved ones; tag-team sushi challenge.

Previously eliminated contestants get the chance to get back in the competition by perfectly frying an egg and preparing a salmon dish.

The cooks must prepare a T-bone steak dish; the challenge winner assigns a type of poultry to the other contestants.

The cooks must re-create popular dishes served at a fine-dining restaurant in downtown Los Angeles; the losing team must prepare a perfect plate of fried calamari with a side of marinara sauce.

The judges are joined by their sons, who help critique a mystery box challenge; re-creating a dish.

Two cooks advance to the finals while the remaining three face a pressure test.

The cooks split into two teams for the mystery box challenge.

The remaining three contestants cook more sophisticated versions of the dishes they made in their initial auditions.

The final two cooks prepare three-course meals; the judges choose the winner.