Heat oil with fennel seeds in a small heavy saucepan over moderate heat until seeds are fragrant and pale golden, 1 to 2 minutes. Remove from heat and let steep 2 hours.
While seeds are steeping, quarter fennel bulbs lengthwise and cut out and discard most of cores, leaving just enough core to keep quarters of fennel intact. Cut fennel lengthwise into paper-thin slices with slicer. Transfer to a large bowl.
Cut radishes crosswise into very thin slices (slightly thicker than fennel slices) with slicer and add to fennel in bowl.
Cut peel, including all white pith, from grapefruits with a small sharp knife. Working over a bowl, cut segments free from membranes and squeeze juice from membranes into bowl. Transfer segments to a cutting board, reserving juice in bowl, and coarsely chop, then add to fennel and radishes.
Pour fennel oil through a fine-mesh sieve into a small bowl. (Discard seeds.)
Mince garlic and mash to a paste with a pinch of salt using a large heavy knife, then transfer to another small bowl. Whisk in salt, pepper, fennel oil, and 5 tablespoons grapefruit juice, then pour over salad, tossing gently to coat.
Cooks' notes: · Fennel oil can be made 1 day ahead and chilled in an airtight container. Bring to room temperature before using. · Fennel and radishes can be sliced 6 hours ahead and chilled, covered with dampened paper towels. · Grapefruit can be chopped 6 hours ahead and chilled, covered. Chill juice separately. · Dressing can be made 2 hours ahead and kept at room temperature or chilled, covered.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	194.83 Kcal (816 kJ)
Calories from fat	85.1 Kcal
		% Daily Value*
Total Fat	9.46g	15%
Sodium	271.98mg	11%
Potassium	1136.75mg	24%
Total Carbs	26.35g	9%
Sugars	1.14g	5%
Dietary Fiber	8.92g	36%
Protein	4.04g	8%
Vitamin C	78.2mg	130%
Iron	2.3mg	13%
Calcium	148.3mg	15%

Amount Per 100 g
Calories	50.01 Kcal (209 kJ)
Calories from fat	21.84 Kcal
		% Daily Value*
Total Fat	2.43g	15%
Sodium	69.81mg	11%
Potassium	291.77mg	24%
Total Carbs	6.76g	9%
Sugars	0.29g	5%
Dietary Fiber	2.29g	36%
Protein	1.04g	8%
Vitamin C	20.1mg	130%
Iron	0.6mg	13%
Calcium	38.1mg	15%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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