Pre heat your grill.
Griddle (or pan fry) your steak each side for 4/5 mins, Turning once. Remove and rest.
Toast your panini, slice and brush with garlic butter.
Pop under grill and toast until golden, remove, add cheese slice, pop back under grill to melt.
Remove and add tomatoes amd spinach, sliced steak, too with mushrooms and onion amd slather with horseradish mayo.
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