Preheat the oven to 200°C/180°C fan. Peel and mince the garlic. Peel and slice the shallots. Slice both types of the zucchinis lengthwise into thin strips (use a peeler to get them extra thin!). Grate the Gruyere cheese.
2 Fry beef
Heat a pan over a medium-high heat with a drizzle of oil. Once hot, add the shallots, garlic and a pinch of salt. Fry for 3 min. Add the beefmince, Worcestershiresauce and marmite. Fry for 5 min or until starting to brown.
3 Season zucchini
Place the zucchini slices in a bowl with a drizzle of oil and a pinch of salt and pepper. Add the dried parsley. Mix well.
Place 1/3 of the zucchini slices in a baking dish. Top with 1/3 of the beefmince and 1/3 of the cheese. Repeat until you run out of the zucchini and beefmince. Reserve enough cheese to top off the gratin. Bake for 20-25 min or until the zucchini is softened.
Slice and serve the gratin. Toss the rocketsalad in a drizzle of olive oil and the Balsamic vinegar. Serve the salad alongside the gratin.
Tips for fussy eaters
Rocket can taste bitter to sensitive palates. Why not swap it for little gem or iceberg lettuce?
Don't overcrowd your pan! Otherwise you'll end up stewing, not frying your beef mince.
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